Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Op-art architecture designed for happiness.

In 2008, this Mexico City metro station was the site of an hours-long fight between emo, punk, and goth groups.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

The last home designed in its entirety by noted architect Luis Barragán owes its existence to an impressive jacaranda tree.

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

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

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

An airy Art Deco space devoted to the weird and wonderful folk art traditions of Mexico.

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

Its exhibits are dedicated to educating the public about state terrorism in Mexico.

Psychedelic murals coat the inside of a nondescript research library.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

History is on display in this hall, which has served as the seat of city government for centuries.