Treasure Island

Treasure Island is an artificial island in the San Francisco Bay and a neighborhood in the City and County of San Francisco. Built in 1936–37 for the 1939 Golden Gate International Exposition, the island's World's Fair site is a California Historical Landmark. Buildings there have been listed on the National Register of Historic Places, and the historical Naval Station Treasure Island, an auxiliary air facility (for airships, blimps, dirigibles, planes and seaplanes), are designated in the Geographic Names Information System.

The Golden Gate International Exposition (GGIE) (1939 and 1940), held at San Francisco's Treasure Island, was a World's Fair celebrating, among other things, the city's two newly built bridges. The San Francisco–Oakland Bay Bridge opened in 1936 and the Golden Gate Bridge in 1937. The exposition opened from February 18, 1939, through October 29, 1939, and from May 25, 1940, through September 29, 1940.

Naval Station Treasure Island is a former United States Navy facility that operated on Treasure Island in San Francisco Bay from 1942 to 1997.

The Treasure Island Development is a 405-acre (164 ha) major redevelopment project under construction on Treasure Island and parts of Yerba Buena Island in San Francisco Bay between San Francisco and Oakland, within San Francisco city limits. The Treasure Island Development Authority (TIDA) is a nonprofit organization formed to oversee the economic development of the former naval station.

Art in Action was an exhibit of artists at work displayed for four months in the summer of 1940 at the Golden Gate International Exposition (GGIE) held on Treasure Island. Many famous artists took part in the exhibit, including Dudley C. Carter, woodcarver and Diego Rivera, muralist. Rivera painted his monumental work Pan American Unity at Art in Action.