ARCADIA. Travelers seeking gardens in Los Angeles head to the Arboretum of Los Angeles County. This 127-acre botanical garden and historical site features plant collections from all over the world, including many rare and endangered species. Ground highlights include the perennial garden, the Meyberg waterfall, a rose garden and a citrus grove. The area also serves as an animal sanctuary, and visitors can see the famous peafowl as well as various migratory birds and aquatic creatures.