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

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

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

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

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

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

Take a dip beneath the stalactites in this amazing cenote.

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

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

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

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

A church dedicated to the Mexican skeleton saint.

Hidden for more than a century, the grave of the Conquistador remains forgotten behind these church walls.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

Diego Rivera hid various people and symbols in his first large-scale mural project.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.