This is something you cannot miss if you ever go to Bermuda. These stunning underground caves are millions of years old and the stalactites and stalagmites are something you have to see with your own eyes to marvel at. You go 55 feet deep into the caves and are surrounded by the limestone and rock formations. The coolest part of the tour is you are able to walk over the waters down a path. Both feature soaring stalagmites and icicles of white limestone dripping from the ceiling; cross the floating bridge to peer into a crystal-clear lake, which reveals more intricate rock formations underwater.