Established in 1771 as the fourth of 21 missions founded in California, this massive adobe complex was dedicated by Father Junípero Serra to St. Gabriel. Within the next 50 years, the San Gabriel Archangel became the wealthiest of all California missions. In 1833 the Mexican government confiscated the mission, allowing it to decline. The U.S. government returned the mission to the church in 1855, but by this time the Franciscans had departed. In 1908 the Claretian Missionaries took charge and poured much care into preserving the rich history. The cemetery here, the first in L.A. County, is said to contain approximately 6,000 Gabrieleno Indians. Tranquil grounds are lushly planted and filled with remnants of what life was like nearly two centuries ago. Public mass is held at the mission Sunday morning at 7 and 9:30, but call ahead as times are subject to change. If you're lucky, you'll hear the six bells that ring out during special services—a truly arresting experience. You can take a self-guided tour of the grounds here by purchasing a map in the gift shop, or come for History Day the first Saturday of every month. Docent led tours can be reserved in advance.