One of the most easily accessible examples of the rare 1960s UFO houses.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

This rusting remnant of the local herring industry is being given a second life.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

The Arctic Circle runs through this isolated spot north of Iceland.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Cold storage for agricultural biodiversity.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

Norway has built what may be the world's most beautiful public toilet.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

This Scandinavian island is the site of the first modern observatory.

Frequent fliers welcome in this airplane hotel.

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

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

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

This region of Slovakia boasts some of the most plentiful opal mines in the world.

Large Hadron Collider and the Birthplace of World Wide Web.