1. 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. Known as the Cheddar Man, the remains were estimated to be 9,000 years old.
2. 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. That’s naturalists not naturists, although no doubt someone has tried to go skinny dipping at one point!
3. Hamilton Pool from another perspective. When there’s been heavy rainfall, 45ft waterfalls cascade from the rim of the cavern. It must be pretty spectacular when you’re bathing.
Stuck in Customs
6. This underground lake in Mellisani Caves, near Kefalonia, was found when the roof of the cave collapsed after an earthquake in 1953.
Liana Photography
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clipped from: www.environmentalgraffiti.com 
