John D. and Adolph Spreckels donated the Spreckels Organ, to the City of San Diego in 1914 for the Panama-California Exposition. This unique organ contains more than 5,000 pipes ranging in length from the size of a pencil to 32 feet and is the largest outdoor pipe organ in the world. The Spreckels Organ 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.
All concerts on the Spreckels Organ are free to the public in accordance with the original Deed of Gift by John and Adolph Spreckels. Concerts are held very Sunday at 2 p.m. for one hour (rain or shine) and on Monday nights comprising the International Summer Organ Festival – concerts will take place at 7:30 p.m. on Mondays from late June through the end of August. At least 62 concerts are scheduled during a typical year.