I came across an extremely interesting legend while researching the city of Ephesus recently... The Legend of the Seven Sleepers.
Around 250AD, when Christians were being fiercely persecuted, seven young men refusing to recant their faith, gave their worldly goods to the poor and retreated to a mountain cave to pray (and await capture, followed by execution I presume), where they eventually fell asleep. The emperor, seeing that their attitude towards Christ had not diminished, ordered the mouth of the cave to be sealed, and effectively sealed their fate.
Two centuries passed and the landowner decided to re-open the cave, thinking to use it as a cattle pen. He did so, and to his astonishment, found seven men sleeping inside. They awoke and believed they had only slept one day. They wandered into the city of Ephesus, and were utterly bewildered at the many churches and the freedom of worship for Christians. The Sleepers later died naturally (and this time permanently) and were buried in the cave in which they had slept.