At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A white Buddhist temple with a golden restroom.

Swedish skyscraper with a 90° twist.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

You've probably seen these distinctive orange-tiled columns on the big screen.

This monumental work of art symbolizes the coming together of a previously divided city.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

An old tram depot transformed into a vintage car paradise.

Metro station with a claim to rock n' roll fame.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

A monument to the man who almost killed Hitler.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

When the rain falls, this drain system turns into a musical instrument.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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