This 1920s Dutch barge is now a floating bookstore.

These 19th-century gas tanks were remade into an apartment complex.

As seen in the Spice Girls ‘Wannabe’ music video.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A brush maker used his factory to protect blind Jews from the Gestapo.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

This classic restaurant features a gorgeous mirror-clad room.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

The first museum in the United States dedicated entirely to posters.

Jimi Hendrix's legendary recording studio in Greenwich Village.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Family-run for more than a century, this pizzeria makes a unique mustard pie.

A towering Art Deco movie palace made to look like a Mayan temple.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Kwanu'sila the Thunderbird has been silently watching over Chicago for more than 100 years (kind of).

The beloved home to all publications indie, erotic, and punky.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.