Petaluma Adobe State Historic Park
The headquarters of General Mariano Vallejo’s vast (66,000 acres at its peak) agricultural domain from 1836 to 1846, this restored compound is the largest extant 19th-century residential adobe in the United States. The mostly low-tech exhibits explain Vallejo’s role as Mexico’s head honcho before California joined the United States and depict daily life for native peoples and Spanish and Mexican settlers.