The Pharos of Alexandria

One of the Seven Wonders of the Ancient World, the Pharos of Alexandria was a lighthouse built by Sostratus of Cnidus in 280 B.C. on the island of Pharos, in the bay of Alexandria, Egypt. The lighthouse operated by means of a mirror to reflect sunlight during the day, and a fire lit at the top of the tower at night. It remained operational for hundreds of years until it was destroyed by earthquakes in the 14th century.