The Golden Gate Bridge links San Francisco with Marin County. Before its completion in 1937, the bridge was considered unbuildable because of foggy weather, 60-mile per hour winds, and strong ocean currents. The bridge sways 27 feet to withstand winds of up to 100 miles per hour. Pedestrains and bicyclists are allowed across the bridge on pathways with sweeping views of the City, Alcatraz and the Marin Headlands.