Walk or bike along a narrow strip of Belgium sandwiched by German territory.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A cableway for car transport.

On this Polish road, an optical illusion makes cars seem to roll uphill.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

These massive moving sand dunes have swallowed an entire village and are still on the run.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

Tens of thousands of tiny bottles stuffed with various items.

The world's northernmost ice hotel.

This lake-bound geographical marker sits at the point where three European countries intersect.

This cairn marks the only place where Central European Time, Eastern European Time, and Further-eastern European Time meet.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

The world's northernmost aquarium looks like it has fallen over.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

This network of narrow, medieval passages has the most delightful name.

The final resting place of the father of modern biological taxonomy.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

A former suicide bridge is now accumulating symbols of love instead of a body count.

From under the bed of one of the co-founders, this server helped launch the notorious file-sharing website.

Walking through this narrow gorge will make you feel like you've fallen into a fairytale landscape.