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Hamilton Pool Hamilton Pool Preserve, in Austin, Texas, was created quite naturally when the dome of an underground cave collapsed revealing this stunning natural pool. It is now frequented by day-trippers and naturalists

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Cheddar Gorge is Britain’s biggest canyon and is found within the Cheddar Caves, where the UK’s oldest complete human skeleton was found in 1903.

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Reed Flute Cave in Guilin, China was discovered during the Tang Dynasty almost 1,300 years ago.

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