Museo de Sonora (Cerro de la Campana)

The Museo de Sonora occupies the former Penitenciaría del Estado, a striking radial-plan prison building completed in 1908 on Cerro de la Campana, the rocky hill that dominates Hermosillo's skyline. Converted into a museum in the 1990s, its cell blocks and courtyards now house exhibits tracing Sonora's geology and paleontology, its pre-Hispanic archaeology, and the living cultures of its Indigenous peoples, including the Yaqui, Mayo, Seri (Comcaac), Tohono O'odham and Pima, alongside galleries on Spanish colonization, the Kino mission era, mining history and the Mexican Revolution in the north. The building's original cellblock architecture, with its central watchtower and radiating wings, is preserved and gives the museum an unusual, slightly severe atmosphere distinct from a purpose-built gallery. From the hilltop grounds outside, visitors get one of the best panoramic views over Hermosillo, making the site worth a stop even beyond the collection itself. The museum periodically hosts temporary exhibitions on specific themes, such as bacanora production or regional textiles, alongside its permanent chronological displays.