A small pack of an ancient, hairless breed of dog once believed to guide souls through the underworld lives on its grounds.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

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

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

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

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

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

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

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

66,000 pieces of art, donated by one of the world's richest men.

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

Part bookstore, part café, and part forest.

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