Fodor's Expert Review 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 to stay for many of the city's homeless people and a meeting point for migrants and immigrants new to the area.

Avoid visiting after dark and be on the lookout for pickpockets.