If you were asked to picture the most beautiful place in the world, you might imagine the cobbled streets of Paris or a Caribbean island. Alluring as they are, however, these sites might just be overhyped. Many of the planet’s greatest panoramas lie below the surface. These caverns run deep below the earth and have morphed into some truly stunning rock formations over the millennia. Of course, many of them are as deadly as they are pretty, so visitors beware! Extensive renovations in 2008 made it into one of the most bizarrely beautiful sights on Earth.