The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

Art and a pun, all in one.

Terrifying derelict military hospital once housed a recuperating Hitler.

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

A small but immensely extravagant palace built by the "Night King."

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A collection of abandoned typographic signs from Berlin and beyond.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

This classic restaurant features a gorgeous mirror-clad room.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The fairy tale castle of the "fairy-tale king."

A surreal museum of extraordinary industrial objects.

The most visited, and possibly most controversial, museum in Germany.

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

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A Jenga-style cylindrical tower of books that appears to go on forever.

Countless grotesque faces stare out from this eerie Prague art wall.

The attic of a four-century-old canal house hides a clandestine church.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.