Rio Secreto: Underground river in Riviera Maya, Mexico

Rio Secreto is a new tourist attraction in the Riviera Maya that thrills visitors with a visit to a natural underground river and the limestone cavern system it winds through. Discovered in 2007, the cave is part of a 7.5-mile long network that is still being explored and mapped.

Most underground river networks such as these are limited to trained spelunkers, since there are sections completely underwater that require diving equipment. Rio Secreto, however, can be experienced on foot in a few hours -- with no swimming experience required -- and enjoyed by all ages.

The caves and cenotes of the Yucatan have figured in Mayan religious ceremonies for centuries, and Moses shared an extensive knowledge and passion for the history, spiritual significance and environmental importance of this unique underworld environment. Along the way you will see and learn about stalagmites and stalactites, natural limestone columns, cathedral-like ceilings, and the small wildlife that inhabits the caves, such as bats and small fish. (Some visitors may think they see snakes on the paths, but these are only roots that wind along the cave floor.)