Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

Few of the many visitors to this resort town know of its hidden Maya ruins.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A flooded Mexican cave that hides a river beneath the water.

These azure waters were thought to lead to the Mayan Underworld.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Take a dip beneath the stalactites in this amazing cenote.

This popular cave pool is truly magical, despite the crowds.

This one-of-a-kind convent boasts a kaleidoscopic exterior of stars and double-headed eagles.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Its sunny hues are believed to have inspired the town's color palette.

A lake at the bottom of the ocean.

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

A hacienda that features all things uniquely Yucatán.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

One of the few places where you can visit a cenote and Maya ruins at the same time.

Iconic red and white plaques show the creative names invented to navigate the city streets.