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This underground cave waterfall is known as Ruby Falls, located in Chattanooga, TN. It is America’s highest underground waterfall.

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Skocjan Caves in Slovenia (One of the largest underground canyons in the world with the Reka river still carving through it)

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Beneath Nottingham Castle, there is a labyrinth of man-made sandstone caves and tunnels that are strongly related to the famous legends of Robin Hood, who was said to use them to escape the Sherriff of Nottingham. Now you can go deeper into Nottingham’s network of man-made caves than ever before, thanks to the brand new Nottingham Caves App.

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Underground Cave Tuff Spot

U is for Underground Cave Tuff Spot Stand Create an Underground Cave with lights and insects | http://adventuresofadam.co.uk/underground-cave-tuff-spot/

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Bottom of Gaping Gill, Yorkshire. Britain's highest unbroken waterfall plunges 328 ft into Gaping Gill, one of Britain's largest and most complex cave systems.

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Glimerton Cove, Edinburgh -a subterranean complex of passageways and chambers carved out of the sandstone bedrock on which this part of Gilmerton stands. Our tips for things to do in Edinburgh: http://www.europealacarte.co.uk/blog/2011/12/19/edinburgh-tips

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World's top 10 jaw-dropping caves

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