Source: Wikipedia: The legend of the Seven Sleepers is a saint's legend with a tradition in Christianity and Islam. It describes how seven young men fleeing religious persecution sought shelter in a cave and, protected by God, fell into a sleep that lasted for several centuries. Myths and legends with a similar motif are widespread.[1] It is believed that the origin of the motif lies in pre-Christian times.
The cave itself cannot be visited, but there are very nice restaurants with a local flair.