Fodor's Expert Review Custom House

Built by the Mexican government in 1827 and now California's oldest standing public building, the Custom House was the first stop for sea traders whose goods were subject to duties. In 1846 Commodore John Sloat raised the American flag over this adobe structure and claimed California for the United States. The lower floor displays cargo from a 19th-century trading ship. The Custom House Store sells Monterey-themed items. If the house is closed, you can visit the cactus gardens and stroll the plaza.