Hellfire Caves, England
Located in West Wycombe in Southern England, the Hellfire Caves were dug out from the chalk and flint rock that is still common in the area. The tunnels stretch more than 400 yards underground. The original excavation project was carried out by a local baron, Francis Dashwood, in the 18th century. The design — narrow passages interspersed with wider chambers — was based on what Dashwood saw when visiting the Mediterranean and Middle East.
The caves are named for a secretive Hellfire Club, whose meetings were held in the caves. Rumors about the mysterious club, of which Dashwood was the head, include everything from various animist rituals to excessive parties where nothing was off limits. Others say that Dashwood and his friends were merely experimenting with the different religions that he had encountered on his extensive travels. The caves have been opened as a tourist attraction since the 1950s. Local legends of hauntings inside the caves have drawn interest from ghost hunters.