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

Huge hole looks down onto an underground beach populated with sea lions.

The singular ruins of a mysterious lost city.

Inside this mountain lies several kilometers of breathtaking caves.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A dark tunnel leads to a striking white crater that seems to be from another planet.

An indigenous take on European design creates a stunning visual overload.

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

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

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

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

This beautifully deceptive waterfall is something far different from what it appears to be.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

Mexico's astounding mummy museum with "the world's smallest mummy."

The winter home of millions of migrating monarch butterflies.

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

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

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

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

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

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

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

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