A perfectly preserved hill village where the buildings are painted like white lace.

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

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

An underground city of salt.

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

What was once an underground Nazi city is now Europe's largest bat reserve.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The two abandoned overpasses are among the largest bridges in Poland.

The oldest wind turbine in Europe, constructed by a group of friends in 1932.

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

A miniatures park with a model of Wolf's Lair as it looked during World War II.

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

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

This 13th century Gothic brick castle is the largest in the world by surface area.

Boats must transform into railroad cars to navigate this Polish canal.

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

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.