Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

The only remaining U-boat that is still floating never actually saw any action in World War II.

One room inside this building mesmerizes all with its parabolic dome.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

This 165-foot water tower has been supplying the residents of Varel with drinking water for more than a century.

The ruins of a castle sat decaying in this park for years before a massive renovation restored this area to its past beauty.

The remains of a Dominican friary, once one of the largest of its kind in the United Kingdom.

This sculpture commemorates a naturalist and an illustrator whose work was a forerunner to modern field guides.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

The Siege of Naarden ended in 1814, but the cannonballs embedded in the town church remain.

For years, the remains of this ancient Roman fortress were hidden under an orchard.

A giant yellow phallus sculpture hidden in the gardens of the Museum Boijmans Van Beuningen.

This monument pays homage to a classic Dutch tune.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This ghost town in Belgium will lose its street art when it ceases to exist.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.