The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Medical history with an amazing, if frighting, collection of wax diseases on display.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A museum in the childhood house of a medical pioneer.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

A plaque pays tribute to the artist's longtime London home.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

The bronze uniforms commemorate the vital role of women during World War II.

The taxidermied remains of a once-great parrot.

This small collection of rare books was uniquely locked up for safe keeping.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A mysterious artist-run cabinet of curiosities and library.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

These ancient ruins hide in plain sight next to a dessert shop.

This graffitied 19th-century building was a prototype of European industrial architecture.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

Inside a former cabaret, seven floors of erotic art.

The curious underground history of keeping Paris clean.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

One of the oldest, well-preserved water treatment facilities in all of Europe.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."