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

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

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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

Real bones which are said to have belonged to a Polish dragon.

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.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

A Cold War secret surveillance tower used to spy on radio communications.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Every part of this unusual home is built into the sandstone rock.

The 14th-century ruins are said to contain healing powers.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

Enormous sandstone towers loom within a Czech forest.

A crucified and bearded female saint.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This former quarry is now a picturesque gorge that hides a sunken lake.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

An Orwellian sculpture with eyeball cameras watches passersby.