Red-hued limestone arch lit by morning sun with snowy cliffs in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Red-hued limestone arch lit by morning sun with snow in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Ronda, Malaga, Andalusia, Spain

Motorway A7 road running through limestone desert, Paraje Natural de Karst en Yesos, Almeria, Andalusia, Spain, Europe

Aqueduct bridge, canyon, Gravina, Bari, Alta Murgia, Apulia, Italy

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Owachomo Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Owachomo Bridge, Utah, United States of America, North America

Bridge across the Zadlascica River Canyon, Tolman Gorges, Triglav National Park, Slovenia, Europe

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The Natural Bridge Arch at Bryce Canyon National Park, Utah, USA. It was carved out of the sandstone by the effects of rain, frost and wind. It is situated between Agua Canyon and Fairview Point and is one of the most iconic sights in the Park.

View above Red Wall Bridge crossing Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Waterfall in Lava Canyon, Mount St. Helens National Volcanic Monument, Washington State, United States of America, North America

A view of Natural Bridge Canyon in Death Valley National Park, California, United States of America, North America

A small waterfall near Kachina Bridge in Deer Canyon, Natural Bridges National Monument, Utah, United States of America, North America

A view of Natural Bridge Canyon in Death Valley National Park, California, United States of America, North America

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.

Queswachaka suspension bridge made from plant fibers, Ichu grass, over the Apurimac, Southern Peru, South America

Queswachaka suspension bridge made from plant fibers, Ichu grass, over the Apurimac, Southern Peru, South America

Rock arch at Natural Bridge viewpoint, Bryce Canyon National Park, Utah, USA, North America

Mesa Arch at sunrise, Canyonlands National Park, Utah, USA

Hole in the rock, Jebel Uweinat, Jabal al Awaynat

Pedestrian suspension bridge over the Hooker River, Hooker Valley Walk, Mount Cook National Park, South Island, New Zealand

Mesa Arch at sunrise, Canyonlands National Park, Utah, USA

Bridge in Taroko Gorge National Park near Hualien, Taiwan, China, Asia

Suspension bridge in Taroko Gorge National Park near Hualien, Taiwan, China, Asia

Metate Arch, Devils Garden, Grand Staircase Escalante National Monument, Utah, USA

Silhouettes of four people standing under Ring Road bridge over Jokulsa a Dal river, Hringvegur, Iceland

Bridge Over Icy Water, Multnomah Falls, Oregon, Usa

Johnston Canyon, Banff National Park, Alberta, Canada