A former ironworks that was the first UNESCO industrial site.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

Theme park featuring miniature replicas of European monuments.

Lavish royal estate punctuated with heated greenhouses.

The history of German architecture is explored across this fairy-scale mini-city.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

A Japanese video game arcade hides in the back of a Swedish pool hall.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

The library's graceful rotunda is like a bibliophile's temple.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

The world's largest model of our planetary system.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

This "floating railway" is one of the world's oldest monorail systems.

A stairway to heaven, or to nowhere at all.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.