This imposing 20th-century castle was abandoned before it was ever completed.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

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

Naturally formed rock city in Poland.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

This man-made mound monument was built out of soil from all across the Polish empire.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

A taxus-tree to which Julius Caesar reputedly tied his horse.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

Abandoned since 1998, this train station has become an oasis for urban explorers.

This old, abandoned hotel offers magnificent views.

A Cold War command center is hidden under an idyllic countryside.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.