The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the one-mile-wide (1.6 km) strait connecting San Francisco Bay and the Pacific Ocean. The structure links the U.S. city of San Francisco, California—the northern tip of the San Francisco Peninsula—to Marin County, carrying both U.S. Route 101 and California State Route 1 across the strait.
About history, before the bridge was built, the only practical short route between San Francisco and what is now Marin County was by boat across a section of San Francisco Bay.
Many experts said that a bridge could not be built across the 6,700-foot (2,000-metre) strait, which had strong, swirling tides and currents, with water 372 ft (113 m) deep at the center of the channel, and frequent strong winds. Experts said that ferocious winds and blinding fogs would prevent construction and operation.
Following decades of public calls to connect the burgeoning metropolis of San Francisco to its neighbors across the mile-wide Golden Gate, city engineer Michael O’Shaughnessy in 1919 was charged with finding someone capable of constructing a bridge at a reasonable cost.
The job went to a Chicago-based engineer named Joseph Strauss, a drawbridge builder who believed he could complete the grand-scale project for a modest $25 to $30 million.
Construction began on January 5, 1933.The Golden Gate Bridge construction project was carried out by the McClintic-Marshall Construction Co., a subsidiary of Bethlehem Steel Corporation founded by Howard H. McClintic and Charles D. Marshall, both of Lehigh University.
The bridge-opening celebration began on May 27, 1937, and lasted for one week. The day before vehicle traffic was allowed, 200,000 people crossed either on foot or on roller skates.
At the time of its opening, it was both the longest and the tallest suspension bridge in the world, with a main span of 4,200 feet (1,280 m) and a total height of 746 feet (227 m).
With its tall towers and famous trademarked "international orange" paint job, the bridge quickly became a famous American landmark, and a symbol of San Francisco.
According to en.wikipedia and history.com