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

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

The relics are stored in a silver reliquary, where they can be seen through glass.

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

A marker honors the brief peace found by a tormented artist in the fictional land of Kcymaerxthaere.

The coffin-shaped church was once home to monks who slept in coffins.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

A collection of old neon signs from all over Poland line a secluded courtyard.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

This antique thermometer honors the creator of the first universal temperature scale.

A small granite monument marks where the borders of three countries meet.

Memorial to the lost dead of Gdansk, whose resting places were destroyed during World War II.

One of only two places in the world where two rivers cross each other without the waters mixing.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

The largest toy museum in Poland showcases Europe's history of childhood.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

A national collection of Communist-era musical posters.

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

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