A barbarous band of serpents guard the bases of these Aztec temples.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The singular ruins of a mysterious lost city.

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

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

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

Mexico City's largest market contains a Willy Wonka-esque wonderland.

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

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

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

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

The only castle in North America to ever house European sovereigns.

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.

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.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Frida Kahlo's childhood home, now a museum of her life and works.