The park includes several structures built in the 1800s. The four main historic museums are the Plaza Hotel, the Zanetta House/Plaza Hall, the Plaza Stables, and the newly reopened Castro-Breen Adobe. Many of the interiors are arranged as furnished vignettes or with colorful and informative exhibits that help create a unique learning environment for people of all ages. The park also features a blacksmith shop, the historic jail, and an early American settler's cabin.