Located on a high ground in the center of Lisbon, Sao Jorge Castle is a historic medieval castle that overlooks the entire city and the Tagus River. The castle dates back to Roman times and was once the residence of the Portuguese royal family. Today, visitors can walk on the ancient walls and explore its ruins and exhibitions while enjoying stunning panoramic views of the city. The courtyards and towers within the castle combine history and natural beauty, making it a must-see for experiencing Lisbon's culture and history.