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
Balboa Park (San Diego) as Florida Canyon. The earliest recreational developments in the park were in the "Golden Hill Park" area off 25th street. The National Register listed the rustic stone fountain designed by architect Henry Lord Gay as the oldest surviving designed feature in the park. Other attractions in the area included a children's park, walking trails, and a redwood bird aviary. Preparations for the 1915 Panama–California Exposition created much of the park's present-day look-and-feel and designed amenities. Beginning in 1909, San Diego Chamber of Commerce president G. Aubrey Davidson suggested that the park hold an expo to coincide with the 1915 opening