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) the northwest corner of the park, while the southwest corner of the rectangle is occupied by a portion of the Cortez Hill neighborhood of Downtown San Diego and San Diego High School, both of which are separated from the park by Interstate 5. Also encroaching on the northern perimeter of the park is Roosevelt Middle School. Two north-south canyons—Cabrillo Canyon and Florida Canyon—traverse the park and separate it into three mesas. The Sixth Avenue Mesa is a narrow strip bordering Sixth Avenue on the western edge of the park, which provides areas of passive recreation, grassy spaces, and tree groves.