Perched on the highest of Lisbon's seven hills, above the old Moorish quarter, the Castle of St George was the royal residence until the late 15th century. Originally built by the Visigoths and later named after King Joao I, the castle, along with much of Lisbon, was severely damaged by a devastating earthquake in 1755. The castle was declared a National Monument in 1910, with rebuilding work starting in 1940 restoring the site to its former state of luxury.
During summer, there are frequent festivals in the castle grounds. There is also a small restaurant and cafe. Perhaps the greatest attraction is the panoramic view from the well-preserved ramparts, as well as beautiful gardens. There is also a giant periscope in the Torre de Ulisses (Tower of Ulysses-Camera Obscura), from where visitors can see spectacular, live images of Lisbon below, reflected onto a large screen.