The island of Patmos is a popular port-of-call during cruises of Greece and Turkey. Most large ships anchor in the natural harbor and tender their passengers into the town of Skala. Plan to disembark early. Although the island is small, there is plenty to see. Among the highlights are an 11th century monastery resembling a castle, a cave where the Book of Revelation was written, scenic overlooks next to picturesque windmills plus charming, cobblestone streets filled with whitewashed buildings.