Balboa Park (San Diego) an outdoor amphitheatre. The Casa Del Prado Theater is the home of San Diego Junior Theatre, the country's oldest children's theatre program. The House of Pacific Relations International Cottages collected on El Prado offer free entertainment shows. The Botanical Building, designed by Carleton Winslow, was the largest wood lath structure in the world when it was built in 1915 for the Panama-California Exposition. It contains large specimen palms and other plants and sits next to a long reflecting pool on the El Prado side. Located in the eastern third of the park is the Morley Field Sports Complex, which includes
San Diego Zoo Safari Park the hospital is the Institute for Conservation Research, which holds the park's Frozen Zoo. Both the park and the San Diego Zoo are run by the Zoological Society of San Diego. The park is away from the zoo, at 15500 San Pasqual Valley Road, east of Escondido, California, along California State Route 78. Although the park is primarily within the San Diego city limits, it has an Escondido address. The San Diego Zoological Society became interested in developing the Wild Animal Park in 1964. The idea of the park began as a supplementary breeding facility for the San Diego Zoo,