One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

An important Mayan religious and trading center dating back to 200 BC.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

In the middle of this historic colonial city resides a modernist government building known as the UFO.

The walls of a colonial-era fort encircle a small, tropical assortment of plant life.

Half-hidden by grassy slopes, this striking Spanish colonial fort is now a museum of underwater archaeology.

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

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

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.

Cave where bat-eating snakes hang down from the ceiling.

Once a year in Pomuch, the dead are taken out for a cleaning.

Take a dip beneath the stalactites in this amazing cenote.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.

These winged Maya figures are the subject of speculation and conspiracies.

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

This small museum explores Mexican history and culture through clothing.

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

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

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

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

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

According to legend, this hacienda was abandoned because of a curse.

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