Mount Roraima, Venezuela
Photo: Luiz Gustavo Rebello da Silva Maia, CC BY-SA 4.0 via Wikimedia Commons
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a large, 10-m diameter sink hole that extends into a small underground cave that has been hollowed out of Roraima's black rock by thousands of years of constant rain.
Colorful (cold) water pools.
A few giant cracks in the rock/plateau.