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.

Cozumel — Mexico's largest Caribbean island — is where easy, affordable diving is an institution.

It's more than just the best drift diving and most popular dive destination in the Caribbean. For many divers, Cozumel is an addiction. To read more about scuba diving in Cozumel, visit scubadiving.com

Where the Desert Meets the Sea: Baja's Pacific Pelagics

Why fly halfway around the world when you can find feisty great whites just south of the border--and just off California.

All you need to know to be an instant expert.

The hottest, coldest, longest, deepest and highest dives in the world. The world's superlative sites and the people who pioneered them.