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Wierzchowska Gorna Cave in Wierzchowie, Poland.
Mammoth Cave NP - Entering Cave - 1992. Scanned from Kodachrome 64 slide.
Red light illuminating the dark cave walls within Mammoth Cave National Park in Kentucky
View of a Salt Mine Cave next to the Salt formations in Garmsar of Iran
caves always had a big part in mankind
The Natural Bridge - Rockbridge County Virginia State Park Trail - Close Up
Old mine for extraction of sand and stone
Thousands of Egyptian Fruit Bats or Egyptian Rousettes roost and fly in massive, tightly packed groups and in a cave in Queen Elizabeth National Park.
Graham Cave SP - Cave Entrance - 1998. Scanned from Kodachrome 200 slide.
Spring landscape in Sigulda, Latvia
July and August -1986, old Positive Film scanned, Tourists are going to adventure Marble Arch Caves, Enniskillen,  Northern Ireland.
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Sterkfontein, South Africa - November 22, 2011: Sterkfontein is a set of caves in Gauteng province, with special interest to paleo-anthropologists. The area is known as the Cradle of Humankind.
Little Natural Bridge in the valley of the river Rak or Mali naravni most, Cerknica - Notranjska Regional Park, Slovenia (Krajinski park Rakov Škocjan, Slovenija)
Horizontal landscape photo of spectacular underground limestone rock formations, lit up by lights, inside the Wombeyan Caves in a reserve in the countryside near Goulburn, NSW.
Photos taken at Maquoketa State park in Iowa that feature trails, caverns, and some unique views.
Daglı sinkhole, Kastamonu, Turkey
artificial cave under earth journey
Stalagmites and stalactites
Photo taken in Beius, Romania
A man climbing through an opening inside a cave with smooth sides and fresh clear water rushing down a rapid in New Zealand
Clearwater Cave, Gunung Mulu National Park, Borneo Island -Malaysia
July and August -1986, old Positive Film scanned, Enniskillen,  Northern Ireland.
National Cultural Heritage Protection of China, Dou Wan Di Gong, wife of King Jing of Zhongshan, Han Tomb in Mancheng, Baoding City, Hebei Province
석회암 동굴의 벽 VD702
Hiking a wooded trail in Kentucky leading to a cave.
The magical underground environment from picturesque different minerals as limonite dripstones creating stalagmites, stalactites, and stalactite spaghetti.
A photographer exploring a cave located in the Céu e Serra Lodge in Carrancas town, Minas Gerais State, Brazil
Kaklik Cave in Denizli, Turkey
Free Images: "bestof:SaltpeterCave.jpg Saltpeter Cave near Natural Bridge Virginia Own 2000-07 Jan Kronsell Caves of Virginia History of saltpeter works"
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Avon gorge and cave arp.jpg
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Scott's_Run,_West_Virginia._Worked_out_coal_mine_near_Pursglove_mine_No._4_camp,_March_1937.jpg
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