Perhaps among the most recognizable landmarks in the United States, the Golden Gate Bridge spans the water between the San Francisco Bay and the Pacific Ocean. Opened in 1937, it replaced the ferry system that was originally used to get people between San Francisco and Marin County. When it opened, it was the longest suspension bridge in the world, a record it held for nearly 30 years. Its engineering has led it to be considered one of the Wonders of the Modern World.