Pharos of Alexandria
Marble lighthouse and watchtower built about 270 BC on the island of Pharos in Alexandria's harbour. Possibly standing 400 feet high, it had, at the top stage, a mirror which reflected sunlight during the day while fire was used during the night. Its reflection could be seen more than 35 miles off-shore. Of the six vanished Wonders, the Lighthouse of Alexandria was the last to disappear. It was destroyed by an earthquake in 1375.