The Lighthouse of Alexandria
Built around 280 B.C., the Lighthouse of Alexandria stood around 400 feet tall, guarding this ancient Egyptian port city. For centuries, it was considered the tallest building in the world. Time and numerous earthquakes took their toll on the structure, which gradually fell into ruin. In 1480, materials from the lighthouse were used to construct the Citadel of Qaitbay, a fortress that still stands on Pharos Island.