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

Perspective from inside a sea cave at Étretat, Normandy, looking out toward the sky through a natural chalk arch.

Vertical ground-level shot inside a cave at Matka Canyon, featuring rugged rock formations illuminated by warm artificial lighting with hints of natural green light in the background.

Rear view of young woman admiring the crystal sea from natural cave on Triopetra beach, Plakias, Crete, Greek Islands, Greece, Europe

Museum in the Chauvet-Pont-d'Arc Cave, UNESCO World Heritage Site, Ardeche, Auvergne-Rhone-Alpes, France, 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

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

Ruby Falls, 145 ft waterfall deep inside Lookout Mountain, Chattanooga, Tennessee, United States of America, North America

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

Cave in Dafines bay, Peninsula of Karaburun, within the Karaburun-Sazan Marine Parc, Vlore Bay, Albania, Europe

View of the blue sea from a natural sea cave of rocks shaped by wind, Punta Molentis, Villasimius, Cagliari, Sardinia, Italy, Mediterranean, 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.

Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.

Split image of lush vegetation and free diver observing lettuce coral, Turbinaria reniformis, next to cave entrance, Palau, Micronesia.

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

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

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

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

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

Tourist stands inside the arc natural cave in portocolom, mallorca, admiring the scenic view of a lighthouse across the blue waters

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

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

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

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

Young spotted hyena (Crocuta crocuta) looking out of the burrow in the morning light, Maasai Mara National Reserve, Narok County, Kenya, Africa

Banded Mongoose (Mungos mungo), mongoose family with pup, at the den, Kruger National Park, South Africa, Africa

Black lava beach, basalt cave with basalt rocks, Reynisdrangar near Vík í Mýrdal, Suðurland, Southern Region, Iceland, Europe

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

Gobabis Rock Art by the San Bushmen, Ghoha Hills or Bushman Hill, about 5,000 years old, Savuti, Chobe National Park, Chobe District, Botswana, Africa

Gobabis Rock Art by the San Bushmen, Ghoha Hills or Bushman Hill, about 5,000 years old, Savuti, Chobe National Park, Chobe District, Botswana, Africa

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

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

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

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

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

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

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

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

Cave architecture along an elongated rock formation, embedded in a green natural backdrop with road, aerial view, cave town, cave monastery, Vardzia, Vardzia, Samtskhe-Javakheti region, Samtske Javakheti, Lesser Caucasus, Georgia

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

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

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

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

Light falling in the cave Grotte di Castellana, Castellana Grotte, Bari province, Apulia, Italy, Europe

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