Dos Ojos

DOS OJOS (TWO EYES)

Yucatan, Mexico

This cavernous cenote with double entry points—hence the moniker "Two Eyes"—is so incredible it was featured in the IMAX flick Journey Into Amazing Cavesand an episode of Discovery Channel's Planet Earth. It's perfect for snorkellers, and though you have to be experienced to scuba dive there to begin with, you'll also need to be seriously brave to surface in the system’s bat cave—which, not surprisingly, earns its name by being inhabited by bats.
see more caves here.