Do not go here alone after dark. Live Science writes:
A giant cave that might have helped serve as the inspiration for the mythic ancient Greek underworld Hades once housed hundreds of people, potentially making it one of the oldest and most important prehistoric villages in Europe before it collapsed about 5,000 years ago and killed everyone inside, researchers say. Cave dwellers apparently used the cavern not only as a shelter, but also as a cemetery and place of ritual.
The complex settlement seen in this cave suggests, along with other sites from about the same time, that early prehistoric Europe may have been more complex than previously thought. The cave, located in southern Greece and discovered in 1958, is called Alepotrypa.
People apparently performed burials in the cave while conducting rituals that involved burning huge amounts of dung and depositing large amounts of colored and finely painted pottery. “The burial sites and rituals that took place really do give the cave an underworld feel.