This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

Mexico City's residents are being watched by this state surveillance headquarters, designed by architects with a flair for intimidation.

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

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

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

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

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

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

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

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

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

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

A quirky and charming restaurant founded by artists.

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

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

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

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.

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

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

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

These two monoliths have stood at the entrance to the neighborhood since the days it was called "Hollywoodland."