A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

An underground city of salt.

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

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.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.

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

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

Special benches that play Chopin's music are scattered throughout his native city.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

A haunting deserted hotel is a favorite with artists and photographers.