What was once a bustling mining installation is now a bustling hub of contemporary art.

Super-heavy Nazi architectural experiment.

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

The most visited, and possibly most controversial, museum in Germany.

A collection of abandoned typographic signs from Berlin and beyond.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Christ's blood preserved in a Belgian town.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Swedish skyscraper with a 90° twist.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

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