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Chapada dos Guimaraes - Pantanal - Brazil

Stock photograph of the Historic Entrance at Mammoth Cave National Park in Kentucky, USA

The Cueva Palombeira, excavated vertically through the hill that presses against the gorge of La Balouta (in Las M dulas, Le n, Spain), is an artificial tunnel constructed for the evacuation of waste material from the gold mine of Las M dulas. Upon entering a few meters into the cavity, one becomes aware of a tunnel cleanly sculpted into the rock, running along the upper part of the cavern, with vertical walls and an arched ceiling. In contrast, the rest of the cavity is a narrow incision with irregular walls, exposing the structure of an ancient fossilized karst gallery. After the construction of the tunnel during the Roman exploitation period of Las M dulas, the continuous flow of mud and waste materials eroded the initial floor, carrying away the weaker materials that sealed the gallery. These materials consisted of alluvial conglomerates. As a result, the tunnel s exit is located at the highest point of a vast cone of debris that fills the La Balouta ravine and reaches the site of Salas de la Ribera, a locality directly built upon the waste materials from Las M dulas.

View of a Salt Mine Cave next to the Salt formations in Garmsar of Iran

The Classic View of Zion Subway (horizontal)

Man Hiker Hiking in Narrow Slot Canyon - Beautiful red rock scenic sandstone canyons with man walking through canyon.

Waterfall inside cave near Pokhara city in Nepal

Hercules Leg Cave at Lava Beds National Monument in California, USA.

Soldier Pass Arch From Inside Soldier Pass Cave, Coconino National Forest, Sedona, Arizona, USA

Kaklik Cave in Denizli, Turkey

Lascaux Cave, France

Layer upon layer of flowstone in Grand Palace area of Lehman Caves, Great Basin National Park, Nevada, USA.

Luray, USA - June 6, 2019: Image of the wishing well in Luray Caverns.

Carlsbad Caverns - National Park are hidden in the Chihuahuan Desert in souther New Mexico have stunning stalactites hanging from the roof of caverns.

Barac caves near Plitvice Lakes, Croatia

석회암 동굴의 벽 VD702

Chestnut Ridge Park Eternal Flame Falls Trail

Karain Cave from the Paleolithic age, where the first people lived, near Termessos National Park

Carlsbad Caverns National Park in New Mexico features smooth flowstone mounds and hanging curtains called draperies. Both flowstone and draperies result from the flow of water, rich in calcium carbonate, trickling down the cavern walls.

Over-under views of limestone formations with a fish illuminated by a flashlight inside an open cenote sinkhole near Tulum, Yucatan, Mexico

The Opening of The Raven Caves Overlooking Oak Creek, Sedona, Arizona, USA

Mother photographing her three kids in a rocky sandstone canyon, Wolfberg Cracks and Arch, Southern Cederberg Wildernis Area, Western Cape, South Africa

Cave view of waterfalls and forest in Lost Valley, Arkansas in Ponca, Arkansas, United States

$Deep underground cave exploration of Karst cave \$

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

Caverns located in the Chihuahuan Desert and stunning treasures. They contain stalagmites and stalactites formed from dipping waters. They can form quickly or whereas limestone may take thousands of years.

Man tourist speleologist in wetsuit with flashlight in beautiful natural cave with cascades of underground lakes in Nizhneshakuranskaya cave, Abkhazia, Georgia.

Rocks near the sea

Beautiful underground caves in the village of Vorontsovka in Sochi in Russia

$Antalya, İbradı, near the village of Urunlu\nThe sediment layers of the cave on the borders of Altınbeşik Cave National Park$

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