Thousands of flowers create enchanting pink tunnels over the city streets.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

A ruined castle stands atop a hill surrounded by dragon lore.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

The largest mosque in Germany.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A medieval gate once used as a prison and how home to a city museum.

This futuristic German television spire is actually the world's largest digital clock.

Tiny memorials honor individual victims of the Holocaust.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

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

Twelve sweet, nutty, life-sized statues are housed in this second-story shrine to almond paste.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

Home to the world's oldest functioning orrery.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This ancient Egyptian obelisk still bears the wounds of World War I.

Its collection includes a broad array of social, geographic, graphic design, and political history.