A 20-meter (65-foot) robot towers over Tokyo Bay.

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

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

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

Museum dedicated to the terror regimes of Hungary.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A museum dedicated to a Cold War era sausage.

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

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

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

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

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

A church of bones, decorated with 40,000 human skeletons.

An enormous and lavish Gothic church in Czechia.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.