Segovia city is located in central Spain near Madrid. It is known for its well-preserved Roman aqueduct from the 1st century AD, which remains a landmark. The Alcazar of Segovia, a royal palace located atop a rocky outcrop, has been an important building since 1122 and was favored by royalty. The Gothic Cathedral of Segovia, completed in the 15th century, is considered a masterpiece. Segovia's historic old town is surrounded by well-preserved walls up to 3 km long with 80 towers.