Regional Historical Museum, Former Barracks of the Compañía Fija

The site features six permanent exhibition rooms: Sala de Paleontología (30 m²), Sala Arqueología del Paleoindígena (20 m²), Sala Arqueología del Arcaico (30 m²), Sala Arqueología Prehistoria Tardía (24 m²), Sala Grupos Nativos de Baja California (24 m²), Sala Historia (24 m²). Fossils of ammonites, gastropods, bivalves, trilobites and shark teeth over 12 million years old are on display, as well as skeletal remains of a mammoth dating more than 10 thousand years old; In the Sala Arqueología del Paleoindígena, stone artifacts such as tajadores, raspadores, desfibradores and fragments of Clovis-type points were used as tools and weapons; In the Sala Arqueología del Arcaico, there are recreations of concheros, funerary customs and rupestrian rock art manifestations, plus elaborated pieces of stone, bone and shell for ritual and daily use; In the Sala Arqueología Prehistoria Tardía, there are objects and activities fundamental to daily life of the ancient inhabitants: a room called wa, tools, acorn gathering, a stone-and-shell necklace with pieces melted during the cremation rite of an infant; some ceramic vessels characteristic of this period; a one‑centimeter‑long projectile point finely crafted in transparent quartz, among many other pieces of bone, shell and wood; In the Sala Grupos Nativos de Baja California, you can see the most common artisanal works of each community and the diversity of their landscapes and how they interact with them through their languages, all of which are highly endangered; In the Sala Historia, the collection includes fragments of Chinese ceramics, wax remnants for hull caulking and tools and clothing used by native groups at contact with missionaries; the missionary era began in 1697 with the Jesuits; when they were expelled, the Franciscans took over evangelization, and finally the Dominicans worked until the mid‑19th century.

The museum has two temporary exhibition areas: Área de las Crujías (63 m²), originally used as soldiers' dormitories and barracks during the military cuartel era, later as jail cells; Área de la Pieza del Mes (16 m²).