The best destinations, dives and deals.

A ferry ride from Cozumel brings us here to the gates of Xibalba, the Maya underworld. We're lured by the cenotes of Riviera Maya, a vast subterranean river system hidden underneath the Yucatan jungle.

Between Cozumel and Belize there's an atoll that's made for divers--and you've never heard of it. Got your attention?