John D. and Adolph Spreckels donated the Spreckels Organ, one of the world's largest outdoor pipe organs, to the City of San Diego in 1914 for the Panama-California Exposition. This unique organ contains 4,530 pipes ranging in length from the size of a pencil to 32 feet and is housed in an ornate vaulted structure with highly embellished gables. Since 1917, San Diego has had a civic organist, who performs free weekly Sunday concerts.