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

The underground mall's skylights look like they could be part of a spaceship.

The unique collection of gifts includes braids of human hair, a spoon, and a Virgin made of bread.

This museum houses two of Mexico's most impressive Aztec monoliths.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

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

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

These biodiverse university gardens form a green oasis amid the urban chaos of Mexico City.

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

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.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.