This extraordinary art museum is like a secret world on the edge of Mexico City.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

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

The Mexican painter Diego Rivera created this unusual museum to display his collection of pre-Hispanic artifacts.

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

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

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

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 separated by a bridge.

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.