Pit in Carlsbad Caverns that looks bottomless but is actually 140-feet deep.
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Mammoth Cave in Kentucky is the world's longest known cave system, with more than 400 miles explored, and one of the oldest tour attractions in North America. Mammoth Cave National Park preserves the cave system, a part of the Green River Valley, and the rolling hills of south central Kentucky.
Veryovkina Cave (also spelled Verëvkina Cave, Abkhaz: ????????? ?????, Georgian: ??????????? ??????, romanized: veriovk'inis mghvime) is a cave in Abkhazia, an occupied region of Georgia. At 2,223 meters (7,257 ft) deep, it is the deepest-known cave on Earth.
Located just 14 miles southeast of Roswell, Bottomless Lakes State Park is your place for bottomless fun! Enjoy non-motorized boating in your kayak or canoe, camp, fish, picnic, swim, hike, go birding or even scuba dive! The unique lakes at this park are sinkholes, ranging from 17 to 90 feet deep.
Most of the nine lakes are almost completely surrounded by cliffs, with the notable exceptions being Lea Lake and Lazy Lagoon. Lea Lake has a large, sandy shoreline on the western side and tall cliffs on the eastern side.
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.