The ceiling of this cavern is dripping with multicolored marble stalactites.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Climb inside an iron crystal magnified 165 billion times its normal size.

Cozy basement bar sports an inventory of over 2,000 beers.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

The Devil’s own choice when he needs a drink in Brussels.

When you're a great Russian Tsar, even your vomit gets a statue.

This enormous steel tube is the biggest speaking horn in the world.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

The world's largest model of our planetary system.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

It houses the remains of a 17th-century version of the Titanic.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This former coal mine, now a fascinating museum, was the site of Belgium's worst mining disaster.

One of the oldest bank museums in Europe showcases unusual currencies of the world and other money-related miscellanea.

Belgium’s famous peeing statue has worn many hats (and coats, and pants), which are on display at this small museum.

Dummies recreate radiological discoveries from history.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

Brussels' favorite peeing boy has a sister.