Houska Castle
Houska Castle in the Czech Republic is shrouded in mystery and dark legends. Built over a large hole in the ground that was said to be a gateway to Hell, the castle has no defensive walls, no kitchen, and few amenities for living—leading to speculation that its true purpose was to seal something in rather than keep invaders out. The castle is believed to be haunted by demons, tortured souls, and other entities that emerge from the abyss it was built to contain.