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The sea caves of Benagil with natural windows on the clear waters of the Atlantic Ocean, Faro District, Algarve, Portugal, Europe

The natural show of Frasassi Caves with sharp stalactites and stalagmites, Genga, Province of Ancona, Marche, Italy, Europe

The natural show of Frasassi Caves with sharp stalactites and stalagmites, Genga, Province of Ancona, Marche, Italy, Europe

Marble Caves Sanctuary caused by water erosion, General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Marble Caves Sanctuary caused by water erosion, General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Marble Caves Sanctuary caused by water erosion, General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Sea caves filled with nesting birds on the south side of Bjornoya, Bear Island, Svalbard, Arctic, Norway, Scandinavia, Europe

Natural windows inside cave at the entrance of Daniel Korkor rock-hewn church, Gheralta Mountains, Tigray Region, Ethiopia, Africa

Sunshine and showers with autumn colours from Rydal Cave, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Tourists admiring the cave during a boat trip on the crystal waters of Melissani Lake, Kefalonia, Ionian Islands, Greek Islands, Greece, Europe

Southern coast, sea and rock formations, Kleftiko, Milos Island, Cyclades Islands, Greek Islands, Greece, Europe

Reflections from Rydal Cave, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Marble Caves Sanctuary, Marble Chapel on General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Macaque monkey on the steps to the Batu Caves with fruit given by passing visitors, Malaysia, Southeast Asia, Asia

Hiker admires the three peaks of Lavaredo from the caves, Natural Park of the Three Peaks, Trentino-Alto Adige, Italy, Europe

Reflections from Rydal Cave in the Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Tourist boats in the crystalline blue waters of Melissani Lake cave, Kefalonia, Ionian Islands, Greek Islands, Greece, Europe

Tourists enjoying a boat trip into the cave at famous Melissani Lake, Kefalonia, Ionian Islands, Greek Islands, Greece, Europe

Marble Caves Sanctuary, Marble Cathedral on General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Natural rock archway carved by the sea through limestone rock at Cuevas del Mar (sea caves) beach, near Llanes, Asturias, Spain, Europe

Small Buddha figures in cave, Pindaya Natural Cave Museum, Pindaya, Shan State, Myanmar (Burma), Asia

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Natural rock archway carved by the sea through karst limestone rock at Cuevas del mar (sea caves) beach, near Llanes, Asturias, Spain.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Congost de Mont-Rebei in the Pre-Pyrenees of Lleida, Catalonia. Serra del Montsec, La Noguera, Lleida, Spain
The Montrebei Gorge (in Catalan Congost de Mont-Rebei) is a place that is located between the provinces of Huesca and Lv©rida (Spain), between the regions of Ribagorza and Pallars JussvÜ. It is constituted in the narrowest part by which the Noguera Ribagorzana river, which constitutes the natural border between Aragon and Catalonia, crosses the Montsec mountain range, walls in vertical fall of more than 500 meters and a width at its minimum point of 20 meters . The Catalan part is part of the Noguera Nature Reserve. It is within the Sierra del Montsec Natural Interest Area.

Historic habitation and cult site of the Ancestral Puebloans, Cliff Palace, partial view with 2 round ceremonial rooms, so-called called Kivas, about 1200 AD, Mesa Verde National Park, Colorado, USA

Ladder into an underground room, Kiwa, Spruce Tree House, a cliff dwelling of the Native American Indians, about 800 years old, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, USA, North America

Kuha Karuhas Pavillon, Phraya Nakhon cave, Khao Sam Roi Yot National Park, Prachuap Khiri Khan province, Thailand, Asia

Riesenburg cave, natural karst cave ruin of Frankendolomite, geotope, natural monument, in the back climber at rock face, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

A young woman in the cave of San Adrian. Mount Aizkorri 1523 meters, the highest in Guipuzcoa. Basque Country. Ascent through San Adrian and return through the Oltza fields

Friends arriving at the cave of San Adrian. Mount Aizkorri 1523 meters, the highest in Guipuzcoa. Basque Country. Ascent through San Adrian and return through the Oltza fields

Stones to grind grain in Spruce Tree House, a cliff dwelling of the Native American Indians, about 800 years old, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, USA, North America

A man jumping into the natural cave in the Algarve on the beach at Praia da Coelha, Albufeira. Portugal

Historic habitation and cult site of the Ancestral Puebloans, Cliff Palace, partial view with 3 round ceremonial rooms, so-called called Kivas, about 1200 AD, Mesa Verde National Park, Colorado, USA

Versturzhoehle Riesenburg, natural karst cave ruin of Frankendolomite, geotope, natural monument, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

Entrance Quackenschloss, passage cave, karst cave, geotope, natural monument, near Engelhardsberg, district of Markt Wiesenttal, Upper Franconia, Franconian Switzerland, Franconia, Bavaria, Germany, Europe

Ladder in a Kiva room for religious ceremonies, Spruce Tree House, Anasazi Native American ruins, Mesa Verde National Park, Colorado, America, United States

Temple of Pan with Pan's grotto, above in the center shrine of Nebi Khader, religious figure for Druze and Muslims, Banias National Park, Mount Hermon, Golan Heights, Israel, Middle East, Southwest Asia

Stones to grind grain in Spruce Tree House, a cliff dwelling of the Native American Indians, about 800 years old, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, USA, North America

Karst cave on the sandy beach near the campsite of Stara Baska, Stara Baska, Island of Krk, Kvarner Gulf Bay, Primorje-Gorski kotar, Croatia, Europe

Cliff dwellings, Spruce Tree House, Anasazi Native American ruins, Mesa Verde National Park, Colorado, America, United States

Cliff Palace, a cliff dwelling of the Native American Indians, about 800 years old, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, USA, North America

Spruce Tree House, cliff dwellings, Anasazi Native American ruins, Mesa Verde National Park, Colorado, America, United States

Spruce Tree House, a cliff dwelling of the Native American Indians, about 800 years old, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, USA, North America