Reclaimed from a sandy shoal in the San Francisco Bay, Treasure Island is a man-made creation built in 1936 during the same era that saw the construction of such California icons as the Golden Gate Bridge and the Bay Bridge. Situated next to rocky Yerba Buena Island, it was initially planned to serve as the location of the new San Francisco airport, but its first official duty was to host the 1939 World's Fair. The island's amazing and varied history includes the Golden Gate International Exposition, a U.S. naval station, a Pan-American seaplane base, mock nuclear tests, tragic fires, and many more dramatic events since it rose from the bay. In addition, a number of historic structures remain on Treasure Island, largely frozen in time since they were constructed in 1936.