Cuevas del Drach are caves located near Porto Cristo in Mallorca, Spain. It contains one of the largest underground lakes in the world. Once you reach the underground lake (Lake Martel), you can see musicians on the boat playing classical music.
"Haunted" Maya Underwater Cave Holds Human Bones archaeologicalnews: “ A flooded sinkhole in southern Mexico so frightens nearby villagers that they won’t go anywhere near it. The ancient Maya seem to.
Australian Photographer John Spies Reveal The Hidden Wonders Of Underground Caves
Reed Flute Cave, Guilin, Guangxi, China "The Reed Flute Cave near Guilin has the most spectacular caves I've seen so far in China. It is a huge system of underground caves with impressive rock formations, stalagmites and stalactites, illuminated with colored lights. The cave can comfortably hold 1,000 people . " - By Huang Xin