Resting on a bluff overlooking the Santa Ana River bed in Estancia Park, the Diego Sepulveda Adobe, also known as the Costa Mesa Estancia or the Santa Ana Estancia, is the second oldest structure in Orange County and stands as a memorial to the early settlers of the area. Originally built between 1817 and 1823 to house the traveling herdsmen who tended horses and cattle from Mission San Juan Capistrano to Alta in the south, the adobe and surrounding land was later purchased and restored by the Segerstrom family in 1940. Today, it stands as a local history museum.

Operated by the Costa Mesa Historical Society, the museum represents four distinct periods in Orange County history, namely Indian, Mission, Spanish, and Victorian.

1900 Adams Avenue, Costa Mesa, CA, 92626, Phone: 714-754-5300

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