The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

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

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

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

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

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

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

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

This classic restaurant features a gorgeous mirror-clad room.

A slice of central Asia in the middle of Berlin.

This collection of solar timekeepers includes the world's first digital sundial.

What was once a bustling mining installation is now a bustling hub of contemporary art.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

Museum in a swimming pool where the water still flows.

Meet the bronze beloved pet to a family of famous peeing statues.

The smallest pub in Britain was once a cabinet of curiosities and it still has the dead cat to prove it.

A complicated contraption for telling time by the moon.

Home to three historic ships from the age of Vikings.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

A subterranean house of worship carved right out of the bedrock.

Steadily reminding Czechia of its past.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.