Boybuloq Cave
The cave is the deepest known cave in Asia having been explored to a depth of from the entrance. At the lowest discovered level a water-filled siphon blocks further exploration. It is thought that the cave has the potential to be the deepest known cave in the world, with a theorised depth of making it deeper than the Veryovkina Cave. The explored length of the cave is .
Tuckaleechee Caverns
Tuckaleechee Caverns () is a set of caverns and AAA GEM attraction in Townsend, Tennessee, near the Smoky Mountains. The caverns were discovered in the mid-19th century and were opened to the public by Bill Vananda and Harry Myers in 1953. The caverns are known for the "Big Room", an immense cave/cavern room that a football stadium could fit inside. The caverns have stalagmites reaching 24 feet tall with flow-stone formations hundreds of feet in length and width.
Open MARCH 15 to NOVEMBER 15
Tuckaleechee Caverns also has the tallest underground waterfall in the country named "Silver Falls", a 210-foot two-tier waterfall. The cavern originates at White Oak Sinks in the Great Smoky Mountains National Park. The Caverns host a seismograph system monitored by the United States Department of Defense,CTBTO and the United States Geological Survey (USGS).