São Jorge Castle is a Moorish Castle occupying a commanding hilltop overlooking the historic centre of Lisbon and Tagus River. The strongly fortified citadel dates from medieval period of Portuguese history, and is one of the main tourist sites of Lisbon. From the millennium-old battlements of this castle you have a bird's-eye view of the city in the company of roaming peacocks. Inside is a small archaeological museum and down the hill are a couple of terraces with perfect postcard views over Alfama, the city's medieval village-like neighborhood.