A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

The only castle in North America to ever house European sovereigns.

66,000 pieces of art, donated by one of the world's richest men.

Part bookstore, part café, and part forest.

Frida Kahlo's childhood home, now a museum of her life and works.

Where once there was a train station bathroom, there is now this German burger joint.

Floating swimming pool within a moored vessel.

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

Blitzkrieg bop your way through Berlin's Ramones Museum.

A museum dedicated to a Cold War era sausage.

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

A black cat protests the City Guild in Riga's Old Town.

3,000 market stands in five former Zeppelin hangars.

Flamboyant architecture from the turn of 20th century.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.

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