Philanthropists John and Adolph Spreckels donated a large pipe organ to be part of the 1915 Panama-California Exposition. Harrison Albright designed the semi-circular Italian Renaissance-style pavilion housing the musical instrument. A self-taught architect from Los Angeles, Albright also designed downtown San Diego’s U.S. Grant Hotel. The ornate vaulted pavilion features highly embellished gables. Located in Balboa Park, the building faces north to protect the 80 ranks of more than 5,000 pipes from the sun’s UV radiation. It is the world’s largest outdoor pipe organ. The pavilion hosts free concerts Sunday afternoon and other concerts throughout the year.