Málaga's history spans about 2,800 years, making it one of the oldest continuously inhabited cities in Western Europe. Popular city for tourism thanks to its architectural treasures. The oldest remains in the city are the walls of the Phoenician city, which are visible in the cellar of the Museo Picasso Málaga.The Roman theatre of Málaga, which dates from the 1st century BC, was rediscovered in 1951. The Moors left posterity the dominating presence of the Castle of Gibralfaro, which is connected to the Alcazaba, the lower fortress and royal residence.