It's always summer at the beach inside this former airship hangar.

A museum honoring Germany’s cucumber mecca offers a great dill of gherkin history.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The site of one of the largest prison escapes of World War II.

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 Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

Enormous sandstone towers loom within a Czech forest.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Two monstrous faces loom over a village in Czechia.

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

The largest manmade caves in Europe now function as a motorbike club's headquarters.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.