This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

The majority of the highest mountain in Poland is actually located in a different country.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

This museum in the tower of the oldest church in Gdańsk, is home to centuries-old time-keeping devices and the world's first pulsar clock.

The last king of Poland was interred in this church nearly 200 years after his death.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Legend says a giant, venomous spider once dwelled within this Polish church.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

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

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.

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

The final resting place of the last "gypsy king" of Poland.

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

In the summer, the area around this sculpture transforms into a vibrant concert venue.

Hundreds of notes give thanks to the patron saint of lost causes.

An open-air museum of 18th-century homes and churches transported from various villages in Southern Poland.

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

The biggest exposition of dental equipement in Europe. And a Mummy.

Relive a Polish uprising via an enormous, century-old cyclorama.

This extensive collection covers thousands of years of Polish military history.

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

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

Come to this Polish museum to take a good, clean look at filth.