St. George's Castle is a historic fortress located in Lisbon, Portugal. Built in the 11th century, it served as a royal palace and military stronghold. The castle offers stunning views of the Tagus River and the surrounding city, making it a popular tourist destination. The castle features impressive walls, towers, and a well-preserved interior. Visitors can explore the grounds, which include gardens and archaeological sites. St. George's Castle is an important symbol of Lisbon's history and a testament to the city's medieval past.