#21: Construction of the Golden Gate Bridge, 1936, San Francisco

The Golden Gate Bridge is a true marvel of engineering, and with its iconic red-orange color and sweeping curves, it has become a beloved symbol of San Francisco and the United States as a whole. But building the bridge was no easy feat – it required years of planning and design, as well as an enormous amount of physical labor and ingenuity.

Construction on the Golden Gate Bridge began in 1933 and took just over four years to complete. The bridge spans the Golden Gate Strait, which connects San Francisco Bay to the Pacific Ocean, and its distinctive suspension design was chosen to withstand the strong winds and currents in the area.