This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

A magical place that lets you play in and explore the world of Studio Ghibli.

Underground farm located in a former bank vault deep within the bowels of Tokyo's business district.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

Not quite the menace it once was, this monster still has some chops.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

Oddly touching memorial to a little-remembered nuclear tragedy.

This 19th century train workshop is a treasure trove of railroad history.

Stalin's secret bunker.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Nightmarish example of the unintended consequences of weapons testing.

The world's second-largest excavated hole.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

An abandoned Indian-inspired mansion.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

The oldest Roman lighthouse still in use.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."