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

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

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

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

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

The stoutest tree in the world.

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

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

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

These unusual paintings give thanks to the saints and deities who granted people favors and miracles.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

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

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

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

A museum in the former home of Marxist revolutionary Leon Trotsky.

Diego Rivera's massive tiled fountain and failed infrastructure project.

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

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

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

An abandoned convention space that has been left to the homeless and the radical.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.