The other day I was talking with a friend about his week-long visit last year to Patmos. While there he of course visited the Greek Orthodox Monastery of St. John the Theologian and the Cave of the Apocalypse. Designated a World Heritage Site in 1999 by UNESCO, it was established about 1,000 years ago, or about 1,000 years after John did his stint on the island and wrote the book of Revelation. As one tours the cave, some very specific matters are pointed out — this is where John slept, this is where he put his hand in an indentation in the cave wall to help him stand up, and this is where he dictated the book of Revelation.