This article first appeared on Tulum, Mexico: A Family Vacation That ... It often looks like a swimming pool inside a cave.

A group of divers have connected two underwater caverns in eastern Mexico ... cave was identified after months of exploring a maze of underwater channels. Near the beach resort of Tulum, the ...

It is easy to see why this is one of the most iconic images of Mexico. Ancient Tulum was at its ... a few while you are ...

For additional underground fun, opt for a tour of the cave's river, where you can swim and snorkel in the ... park was less busy than other spots in Tulum. Travelers recommend setting aside ...