There is perhaps no landmark of San Francisco, and perhaps even the entire state of California, more iconic than the Golden Gate Bridge. This much-photographed bridge spans the Golden Gate, the strait separating San Francisco (to the south) and Marin County (to the north). The 2.7-kilometer-long (1.7-mile-long) bridge was completed in 1937 in one of the most remarkable engineering feats of its time. Although the idea of traversing the Golden Gate by way of a bridge had been discussed for decades, the fear that fog and wind would make the project nearly impossible discouraged planners. In the end, the bridge was completed in four years at the cost of $35 million as well as the lives of 10 construction workers. A pedestrian path along the bridge offers stunning views of the bay and San Francisco as well as an up-close look at this Art Deco wonder.