The historic sights of Old Mazatlan are concentrated in a rather limited area near the Plazuela Machado, a small, tree-filled square with a wrought-iron kiosk in the center. Nearby is the ornate, neoclassical Teatro Angela Peralta, which opened in the 1860s and was later renamed for the singer: she died of yellow fever a few days before she was to perform here.
On the edge of the historic district are several other spots worth the walk. The late 1800s church here is an oddity in several respects, including Moorish touches and even Stars of David by the door. The main zocolo is not nearly as attractive as Plazuela Machado, but is a good spot for watching how the locals bide their time.