Stretching approximately eight miles, these beautiful underground passageways (dubbed ... del Carmen Airport is the closest ...

the Palawan underground river in the Philippines and Vietnam's Son Trach River vied for the record as the world's longest. The area in southeast Mexico is home to tourist resorts Cancun and ...

The region is home to nearly 20,000 known cenotes, with most within a few hours drive of Cancun, Playa del Carmen ... visitors to swim in this underground river and offers ziplining and some ...