This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Started as a kitchen garden, now the second largest botanical garden in the world.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

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

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

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

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

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

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

The best bagels in Berlin are tucked away in an independent bookstore.

Cold war icon and onetime "hole" in the iron curtain.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

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

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

This curious sculpture represents the perseverance needed to take to the skies.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

A particularly disconcerting tribute to Irish martyrs.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

This supermarket offers shoppers a window into the past alongside their groceries.

Some of the saint's blood and bones are said to reside in Dublin.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.