Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.
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The Son Doong Cave in Vietnam is the largest cave passage in the world. This huge and intricate cave system was created by water that percolated down from a rainforest above, ultimately carving into the rock.
#1: United States Caves (45,000)Stretching from sea to shining sea, the United States harbors an estimated 45,000+ caves, the product of millions of years of geology at work. The country's varying terrains — limestone-rich regions, rugged mountains, and desert areas — offer a diverse array of caves.
The Geological History of the Jenolan CavesScientists have determined, through the examination of the clay found in the caves, that the Jenolan subterranean system is around 340 million years old. This makes it the oldest known and dated open cave system in the world, and it is still being heavily researched today.