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Bermuda's limestone caves have been attracting attention since the island was first settled. As far back as 1623, Captain John Smith (of Pocahontas fame) commented on these "vary strange, darke, and cumbersome" caverns. Nevertheless, it came as a surprise when two boys, attempting to retrieve a lost ball, discovered Crystal Cave in 1907. The hole through which the boys descended is still visible. But, thankfully, you can now view their find without having to make such a dramatic entrance. Inside, tour guides will lead you across a pontoon bridge that spans a 55-foot-deep subterranean lake. Look up to see stalactites dripping from the ceiling or down through the perfectly clear water to see stalagmites rising from the cave floor. Amateur spelunkers can also journey through geologic time at Crystal's smaller sister cave, Fantasy. After being closed to the public for decades, it reopened in 2001. Set aside 30 minutes to see one cave; 75 minutes if you plan to take in both.