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The Los Angeles County Arboretum and Botanic Garden, 127 acres (51.4 ha), is an arboretum, botanical garden, and historical site nestled into hills near the San Gabriel Mountains in Arcadia, California, United States. Open daily, it only closes on Christmas Day.The Arboretum is located across the street from Santa Anita Park, the horse racetrack, and The Shops at Santa Anita.

Queen Anne Cottage and Coach Barn is a Victorian style pair of buildings at Baldwin Lake, on the grounds of the Los Angeles County Arboretum and Botanic Garden, located in Arcadia and the San Gabriel Valley of southern California.Elias Jackson "Lucky" Baldwin built the elaborate Coach Barn near the pond in 1879, and 'Baldwin's Belvedere' or the Santa Anita Ranch Guest Cottage on a peninsula in the pond in 1885−1886.

Baldwin Lake is a sag pond in the Los Angeles County Arboretum and Botanic Garden, which is in the San Gabriel Valley of Southern California, south of the San Gabriel Mountains. The pond, arboretum, and botanic garden are all within the city of Arcadia.The pond is fed by stormwater and natural springs; water flows out of the pond to the aquifer at Raymond Fault, and on to the Rio Hondo.

The Reid-Baldwin Adobe, formerly called the Hugo Reid Adobe, is an adobe house built in 1839. It is located at the Los Angeles County Arboretum and Botanic Garden in Arcadia, California. The Hugo Reid Adobe was designated a California Historic Landmark (No. 368) on April 3, 1940. The Reid Adobe was built by Scottish−Mexican Hugo Reid on the shore of what is now called Baldwin Lake, with the help of local natives.

Alyeupkigna (also, Aleupkigna and Almpquig-na) is a former Tongva-Gabrieleño Native American settlement in Los Angeles County, California.It was located at Santa Anita, in the San Gabriel Valley, at the base of Little Santa Anita Canyon.Alyeupkigna Rancheria was established in 1800 as an agricultural outpost of Mission San Gabriel Arcángel.