Held just years after the 1906 earthquake the Panama-Pacific exposition had actually been in the planning stages since 1904. Much of the site was built in landfill that partly consisted of debris from the earthquake. It's most visible remnant is the Palace of Fine Arts which was originally made out of plaster and rebuilt with permanent materials in the 1960's.

San Francisco also hosted the 1894 California Mid-Winter Exposition and the 1939-'40 Golden Gate Exposition.

Tower of Jewels and the Palace of Liberal Arts

LINKS:
The Panama-Pacific International Exposition - part of the San Francisco Memories siteCentury of Progress Exposition: Wings of a Century - 1933 short film
Panama-Pacific International Exposition - edited by Jim Zwick
Panama-Pacific International Exposition - from the Museum of the City and County of San Francisco
Panama-Pacific International Exposition -1st of 2 short films from Archive.org
Panama-Pacific International Exposition -2nd of 2 short film from Archive.org
The 1915 Panama-Pacific International Exposition of San Francisco -from AskART.com
Early California Expositions -from The-Forum On-Line Antiques Mall
1915 Panama-Pacific International Exposition Coinage -from the Willamette Coin Club
1915 Liberty Bell in San Francisco -from the Liberty Bell Museum
Panama-Pacific International Exposition -from Wikipedia
Panorama View of the 1915 Panama-Pacific International Exposition