Now harmless, this looming post struck fear into the heart of medieval troublemakers.

The medieval ferry service has been going strong since the 14th century.

The bridge that cost Germany a World Heritage Site.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A collection of abandoned typographic signs from Berlin and beyond.

A surreal museum of extraordinary industrial objects.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An eerie, derelict amusement park in Berlin.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Large Hadron Collider and the Birthplace of World Wide Web.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The curious underground history of keeping Paris clean.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.