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Wind Cave National Park, South Dakota - United States

Two men look at cave paintings in a sandstone shelter in southern Utah.

Red sandstones formations into the Foradada cave in the Areny mountain in Mont-Roig, Tarragona, Catalonia, Spain. Textures natural background.

Unique underground geology of stalactites and stalagmites.

Wind Cave National Park, South Dakota in Summer

A panorama of formations in a sandstone wash that has been called “Swiss cheese” and other fanciful names, but are currently referred to by the more prosaic term “solution cavities”. These examples are found in Capitol Reef National Park, Utah.

Mae Sap Cave in Khun Khan National Park at Chiang Mai Province, Thailand.

Laas Geel, Maroodi Jeex region, Somaliland, Somalia: rock overhang in a red granite formation, sheltering prehistoric parietal paintings - ‘Laas Geel’ translates as ‘where the giraffes once watered’ and has some of the earliest and best-preserved rock art in the African continent, suggested dates vary between 4000 BC and 3000 BC.

A woman climbs a route in Colorado

Red light illuminating the dark cave walls within Mammoth Cave National Park in Kentucky

Phong Nha-Ke Bàng National Park is a protected area known for its ancient limestone karsts and vast network of caves.

Cliff cave dwelling with ladder.

Stalactites in the Barton Creek Cave, Cayo, Belize, South America

Curtain formation in Altınbeşik Cave

Deep mine of potash production. Beautiful patterns of sylvinite ore.

Close view of Antelope Canyon rock formation

Mid adult man rock climbing in an extreme location in the mountains of Japan

Cave formations in Boiu de Sus Cave, Romania

Panorama shot of ruins of old historic clay town in mesa verde national park in america, usa

A man rock climbing in a huge gorge

Stalactites in a karst cave

a man interested in the phoneKarain Cave

Rocks and stones in Neptune Caves, underground rock formation illuminated with artificial light forming shadows, cracked, rough and uneven walls, Couvin, Wallonia, Belgium

Close up of Stalactite, Rocks and Stone

Landscape details from mysterious small rock windows

In southwest Colorado, well-preserved Ancestral Puebloan cliff dwellings.

View of natural rock bridge Imi-n-Ifri near village Demnate, Morocco on the foothills of High Atlas Mountains looking similar to the silhouette of the African continent.

Scenic canyon in Deyang， China

Water Cave of the Sierra de Baza - Granada - Spain.

Rock wall erosion along the banks of the Musselshell river in central Montana, in western USA of North America.

Free Images: "bestof:Boxwork-in-Wind-Cave-285-pix.jpg en Boxwork in Wind Cave 2011-01-10 04 07 43 http //www nps gov/wica/photosmultimedia/photogallery htm National Park Service of"

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