The walls of the 12th century Crusader castle at Byblos, Lebanon. Byblos is considered the oldest continuously inhabited city/town in the world (at approx 8,000 years) and was founded by the Phoenicians. The castle walls are decorated with the columns of a former Greek (or Roman?) Temple which was demolished to make way for the castle. The stone columns of the temple were cut using a rope, water and sand. As shown in the second pic.