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The Potočka Zijalka cave is archaeologically and paleontologically one of the most important caves in Slovenia. There were found the bones of cave bear and tools belonging to Stone Age hunters dating from around 30,000 years ago.
Seven sleepers mosque aka Yedi uyurlar camii and Cave of seven sleepers in Tarsus, Mersin, Turkey
This photograph was taken in France on June 17, 2023. The source of Fontestorbes is a large exsurgence, of the Vaucluse type and one of the ten largest in France, located in Ariège in the commune of Bélesta, about one kilometer south of the village, along the departmental road no. in Fougax-et-Barrineuf. It looks like a monumental porch opened in the cliff limiting the plateau of Sault to the north, from which a veritable river 5 meters wide springs in cascades and with a deafening noise. After only 50 meters of cascading course in the open air, this river immediately flows into the Hers-Vif, on the right bank of this watercourse, the flow of which it more than doubles.
Wulong karst formations in China.
Rock Formation Light Painting Bryce Canyon Utah - Night photography with sky full of stars and colorful light painting on rock features.
deep pit in the forest, fall
Unique underground geology of  stalactites and stalagmites.
Natural texture of the Damlatas cave ceiling with many stalactites (Alanya, Turkey). Brown-orange-yellow pattern of spiky conical mineral formations on the surface underground
Thor's Cave in Peak District
weathered Buddha sculpture in Cave 9 at Yungang Grottoes, ancient Chinese Buddhist temple grottoes built during the Northern Wei dynasty near the city of Datong, in the province of Shanxi. They are excellent examples of rock-cut architecture and one of the three most famous ancient Buddhist sculptural sites of China. The others are Longmen and Mogao.
Cave church, panorama from man-made caves, Lesnovo, Macedonia. In the peaks of mountain near monastery complex there are a number of man-made caves, and commemorative plaques.
Kaklik Cave in Denizli, Turkey
entrance to the cave
White mineral formations in the Kaklik Cave in Denizli, Turkey
August 25, 2021. Simferopol region, Crimea, Ukraine. For a group of tourists there is an excursion to the Emine-Bair-Khosar cave. Selective sharpness.
Gilfenklamm gorge. Racines. Autonomous Province of Bolzano. Trentino-Alto Adige. Italy.
Natural entrance to Wind Cave, Wind Cave National Park, South Dakota, USA
The Buso della Rana in Monte Malo is the largest cave in Veneto
Horma Canyon, Kure Mountains National Park, Kastamonu, Turkey. Wooden walking path.
A female hiker in the Pokljuka gorge,Bled,Gorenjska ,Julian alps, Slovenia
A starry night in Arches National Park. The north window arch is silhouetted against the beautiful sky.
Double Arch Milky Way Galaxy Arches National Park Utah - Landscape scenic in icon national park of double arch formation with sky and stars above.  Arches National Park, Utah USA.
Bouquet of aragonite, Gouffre Géant de Cabrespine, Giant chasm of Cabrespine
Natural cave at Cala Luna, a famous tourist destination in Dorgali municipality. Province of Nuoro. Sardinia. Italy.
Small, natural rock tunnel in Hocking Hills, Ohio
석회암 동굴의 벽 VD702
Caves in the Zhiguli mountains. Russia.
Stars above the hill in a night sky.
old abandoned galleries, adits, for extraction and processing of natural stone and gypsum cave. Dark eerie stone, quartz tunnels deep in earth. Various rocks, geological and speleological research.
Hiker on Arch at Night with Headlamp Under Milky Way - Red rock arch with hiker stargazing with headlamp and headlamp beam projecting out into space.
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