A spiral staircase twists to the top of this unusual Czech lookout tower.

Two monstrous faces loom over a village in Czechia.

This artificial cave looks like something out of a fairytale.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A church of bones, decorated with 40,000 human skeletons.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

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

This fairytale medieval church in Poland originally spent centuries in Norway.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

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

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

A peculiar family mausoleum built by a German nobleman captivated by the occult.

Naturally formed rock city in Poland.

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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.