A wunderkammer of mysterious objects and stories.

A surreal museum of extraordinary industrial objects.

A slice of central Asia in the middle of Berlin.

An eerie, derelict amusement park in Berlin.

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

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

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

Op-art architecture designed for happiness.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

One of the best collections of wax anatomical models in the world.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

This cubist Vienna church building looks like some sort of alien stonehenge.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

A spherical "micro-nation" in the heart of Vienna.

A Hungarian pharmacy museum with a box full of mummy powder.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

An abandoned masterpiece of Soviet Brutalist architecture.

A memorial to the murdered Jews of Kaunas.