Discover this awe-inspiring sinkhole in China! Learn about its breathtaking size and why it's a must-see natural wonder for ...

Ever since 1956 ... to Krubera Cave drops down a chain of pitches, cascades, and pits—some more than 100 meters (328 feet) deep—connected by narrow rift passages called meanders.

World’s highest and deepest waterfall: Some of you may refuse to believe it, but the world’s highest and deepest waterfall lies underwater! Known across the world as the Denmark Strait ...