Queen Anne Cottage at the Los Angeles County Arboretum & Botanic Garden. Photo courtesy Historic Resources Group. Los Angeles County Arboretum & Botanic Garden Millard Sheets, Architectural Designer Allison & RibleHarry Sims BentEdward Huntsman-Trout, Landscape ArchitectThe Arboretum's Cultural Landscape Report and Treatment Plan provides a vital guide for caring for the wide range of resources on this historic site.