For Its 100th Birthday, Looking Back at the Panama-Pacific International ExpositionCrowd in front of grandstand at opening day ceremony, via SAN FRANCISCO HISTORY CENTER, SAN FRANCISCO PUBLIC LIBRARY This Friday marks the 100th anniversary of opening day for the 1915 Panama-Pacific International Exposition.

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@CurbedSF shows off some #AMAZING pis of SF during the 1915 Panama Pacific Expo.