Golden Gate Bridge 75th Anniversary
Planners ultimately rejected Chicago bridge builder Joseph Strauss' original design for the bridge, shown here. Historians credit Strauss with managing the project, securing funding and pushing the bridge from talk to reality.
But now officials are recognizing the work of another engineer, Charles Ellis, whose mathematics made the final design possible. The bridge's managers will unveil a plaque crediting Ellis' work this week.
Image credit: California Historical Society