The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A tribute to the builder(s) of Bitcoin.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

The topiary maze at the Habsburg hunting lodge.

This former insane asylum now holds a pathological anatomy museum.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The house that took a plunge into the facade of a museum.

The beautiful baroque library of the Hapsburg empire.

A silly medieval mural preserved on the side of a Viennese house.

More than a millennium's worth of municipal records preserve the political history of Austria.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This doorless 20th-century elevator doesn't stop or slow down.