The Castelo de São Jorge
If a city can be said to have a birthplace, Lisbon's is the massive stone bluff which soars over the Tagus River Basin. This hill was home to the earliest humans to populate the area, and has served as a fortress and a castle for centuries of Romans, Moors and Christians. Today, the remains of the Castelo de São Jorge serve mostly tourists, who show up in droves to take in the best views in the city.