A cave in the Jerusalem Hills may once have served as a local oracle where people communed with the dead in the hopes of learning about the future. Known as the Te’omim Cave, the creepy crevice is littered with human skulls and other items associated with necromancy, and is described by researchers as a possible “portal to the underworld”.

Analyzing the discoveries made at the cave, the authors of a new study suggest that Te’omim might have hosted “secret rites involving necromancy and communication with the dead, mainly by witches.”