De Young attended the World's Columbian Exposition in Chicago as a national commissioner appointed by President Benjamin Harrison and came home with a plan. California was deep in an economic depression, and de Young recognized that a world's fair -- staged in winter, when California's climate advantage was most dramatic -- could attract visitors, investment, and national attention. He moved fast, organizing the exposition in Golden Gate Park and opening it just months after the Chicago fair closed. The timing was the message: while Chicagoans froze, San Franciscans could demonstrate that their city operated year-round, unbothered by the seasons that paralyzed the rest of the country.

The Midwinter Fair filled Golden Gate Park with temporary exhibition buildings, international pavilions, and attractions designed to astonish. The Santa Barbara Amphibia featured a 40,000-gallon seawater tank showcasing marine life from the Santa Barbara Channel. International exhibits brought visitors face-to-face with cultures from around the Pacific Rim. The fair was smaller and less ambitious than its Chicago predecessor, but it had one advantage no other American exposition could match: the weather. Visitors who had never been west of the Rockies arrived to find green lawns in January and shirtsleeve temperatures in February, exactly as de Young had promised.

When the exposition closed on July 5, 1894, most of its structures were dismantled, as was the custom with world's fairs. But the Midwinter Fair's most lasting contribution was not a building -- it was the proof of concept that Golden Gate Park could serve as a major cultural venue. The fair demonstrated that the park's western sand dunes, laboriously planted and irrigated by superintendent John McLaren, could host hundreds of thousands of visitors without collapsing into mud. It established the precedent for the park's future role as San Francisco's cultural commons, the space where the city would hold its largest public gatherings for the next century and beyond.

Michael de Young's ambitions for the fair extended past the closing ceremonies. The Midwinter Exposition helped establish the de Young Memorial Museum, which grew from the fair's Fine Arts Building and today anchors the western end of Golden Gate Park as part of the Fine Arts Museums of San Francisco. De Young understood that fairs are temporary but institutions endure. The museum he helped found has survived two earthquakes, a Depression, and a complete architectural replacement -- the original Egyptian Revival structure gave way to a copper-clad modernist building by Herzog & de Meuron in 2005. Through it all, the de Young Museum has remained what the Midwinter Fair first envisioned: a place where San Francisco displays its collection of the world.