The city's Marco Zero ("zero milestone") is located at Praça da Sé, indicating the directions of the states that share boundaries with São Paulo and from where the distance of any point in the state starts being counted. Catedral Metropolitana da Sé (Sé Metropolitan Cathedral) is located there. The square has a gothic style, started being built in 1913 and it was completed only four decades later.

With a height and width of 11 meters and 46 meters, respectively, 92-meter high towers, a 30-meter high dome, and a capacity for 8,000 people, it is the biggest church in São Paulo. In its crypt, which can be considered an underground church, there are sculptures by Francisco Leopoldo.