California's 1826 Spanish land-grant adobe and the Battle of Dominguez Hill
18127 South Alameda Street, Rancho Dominguez, CA 90220
Research updated May 2026
Age
All Ages
Cost
$
Suggested donation for guided tours; verify with the Dominguez Rancho Adobe Museum.
Access
Wheelchair OK
Adobe-era buildings, gravel paths, and surrounding park grounds
Equipment
Photos OK
Est. 1826 · California Historical Landmark No. 152 · National Register of Historic Places (1976) · Spanish land grant Rancho San Pedro · Battle of Dominguez Rancho (1846)
The Dominguez Rancho Adobe occupies the historic core of Rancho San Pedro, the first Spanish land grant in what is now California. The original 75,000-acre grant was made in 1784 by King Carlos III of Spain to Juan Jose Dominguez, a retired Spanish soldier who had accompanied the Portola expedition and Father Junipero Serra. The grant encompassed what is today the Los Angeles harbor, the Palos Verdes Peninsula, the coastal cities of Redondo Beach, Hermosa Beach, and Manhattan Beach, and extended eastward to the Los Angeles River.
The adobe building that stands today was completed in 1826 by Manuel Dominguez, who inherited and re-validated the grant under Mexican rule. The thick adobe walls and tile roof are characteristic of early-California Spanish colonial construction. The house served as the family residence and the principal stop on travel routes between the port of San Pedro and the pueblo of Los Angeles in the late 1820s through the 1840s.
On October 8, 1846, during the Mexican-American War, the eastern slope of Dominguez Hill was the site of the Battle of Dominguez Rancho, sometimes called the Battle of the Old Woman's Gun. A force of Californio defenders under Jose Antonio Carrillo, using an old field gun, repulsed United States Marines under Captain William Mervine, who had occupied the rancho buildings the previous night. The encounter lasted roughly an hour and is one of the few engagements of the war fought in the immediate Los Angeles area.
The Dominguez Rancho Adobe is California Historical Landmark Number 152 and was added to the National Register of Historic Places in 1976. The Friends of Rancho San Pedro operate the building as the Dominguez Rancho Adobe Museum and offer guided tours and educational programs.
Sources
Local tradition holds that the grounds around the Dominguez Rancho Adobe are occasionally visited by small bright lights, sometimes described as orbs, moving rapidly through the park surrounding the adobe at night. The most commonly repeated explanation among ghost-story compilations is that a traveler who stayed at the ranch during its 19th-century stagecoach-stop era was robbed and beaten on a nearby road and died of his injuries; the lights are said to be associated with this account.
The museum itself does not promote investigation or ghost-tour activity, and the lore is not part of the formal interpretive program. As with most stagecoach-era ranch sites in the American West, oral tradition has accumulated around the property over time without independent documentation in newspaper or court records of the period. Visitors who wish to learn more about the documented history of the rancho should consult the museum's guided programs.
Tour the 1826 adobe ranch house of Manuel Dominguez, son of the original Spanish land-grant family. The Friends of Rancho San Pedro lead guided tours that cover the Spanish and Mexican periods, the 1846 Battle of Dominguez Rancho during the Mexican-American War, and the working ranch era.
The eastern slope of Dominguez Hill, adjacent to the adobe, is the site of the October 8, 1846 Battle of Dominguez Rancho (also known as the Battle of the Old Woman's Gun), where Mexican Californians temporarily repulsed United States Marines under Captain William Mervine.
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