The Castelo de São Jorge (St George’s Castle) looks down over Lisbon from São Jorge hill and is a Moorish castle which has been used as a defensive structure for the city since the 10th century. It was the home of Portuguese kings and queens until the completion of the more elaborate Ribeira Palace and became a military fortress until it was badly damaged in the 1755 Lisbon earthquake. In the 20th century, parts of the site were restored and today visitors can see the reconstructed battlements and ruins of the original buildings.