Praça da Sé
This large plaza marks the city's geographical center—the 0 km point, as it's called here—and holds the city's main cathedral, the beautiful Catedral da Sé. It can't be missed when you're visiting the rest of the historic downtown, but know that the square has become a place where many of the city's homeless people stay at night and a meeting point for migrants and immigrants new to the area. During the day, just stay alert for pickpockets. The area is well-policed and maintained by the city government.
Avoid visiting after dark and be on the lookout for pickpockets.
