Home to the world’s oldest seismograph and a four-ton steel ball that makes its own earthquakes.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

This natural history museum houses one of the world's largest rat kings, a terrifying jumble of tangled rodents.

A geothermal energy project gone wrong is fracturing the city's picturesque architecture.

One of the most easily accessible examples of the rare 1960s UFO houses.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

This famed marionette theater and museum is bursting with imaginative string puppets.

A graveyard and memorial chapel for victims of leprosy.

Sausages, schnitzel, and weiners.

The atomic museum in the basement of this German castle displays long strands of replica uranium cubes.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

The monumental home of Prussia’s eccentric "Cannon King."

A university observatory dome painted like the beloved "Star Wars" robot.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

Fantastic views and thousands of love locks.

Legendary site where an evil bishop was devoured by rodents.

This historic little railroad runs through some of the most beautiful scenery in Germany.

This extremely narrow tenement boasts a maximum occupancy of just two.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

Go surfing on this urban wave, "hacked" by local surfers.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.