A Belgian self-built tower inspired by the Bible and ancient civilizations.

Hiding the longest subterranean river known in the world.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Lavish royal estate punctuated with heated greenhouses.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

"Medieval" castle built in the mid-20th century by one family.

300 years of pharmaceutical history on display.

The abandoned military base looks like a post-apocalyptic wasteland.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

Hungarian self-built castle.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

This street has over a half-dozen names, all at once.

This stunning mountain lake was named for a pair of tragic lovers whose statues stand at the center.

A Kyiv-based repository for all manners of discarded curiosities.

This Ukranian fortress is one of the best-preserved medieval castles in Europe.

The last planned Soviet city was built for the former residents of Pripyat after the Chernobyl disaster.

Marvel at the excessive luxury of the ousted Ukrainian president's former estate.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

Remains of a station that only operated for one year.