The Golden Gate Bridge, United States

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the opening of the San Francisco Bay onto the Pacific Ocean. As part of both U.S. Route 101 and State Route 1, it connects the city of San Francisco on the northern tip of the San Francisco Peninsula to Marin County.

The Golden Gate Bridge had the longest suspension bridge span in the world (4,200 foot) when it was completed in 1937 and has become an internationally recognized symbol of San Francisco and California.

Despite its red appearance, the colour of the bridge is officially an orange vermilion called international orange. The colour was selected by consulting architect Irving Morrow because it blends well with the natural surroundings yet enhances the bridge's visibility in fog.

The bridge's two towers rise 746 feet making them 191 feet taller than the Washington Monument. The five lane bridge crosses Golden Gate Strait which is about 400 feet, or 130 meters, deep. The bridge consists of two towers of 746 feet this makes it 191 feet higher than the Washington Monument. The five lanes of the Golden Gate Bridge are about 400 feet or 130 meters deep.

The towers that support the Golden Gate Bridge's suspension cables are smaller at the top than at the base, emphasizing the tower height of 500 feet above the roadway Coit Tower is another San Francisco landmark with an Art Deco design.

Linking San Francisco with Marin County the Golden Gate Bridge is a 1.7 mile-long suspension bridge that can be crossed by car, on bicycles or on foot. On an average day 118,000 vehicles cross the bridge. The bridge has six total lanes of vehicle traffic, and walkways on both sides of the bridge.

The speed limit on the Golden Gate Bridge was reduced from 55 mph (89 km/h) to 45 mph (72 km/h) on 1 October 1983. The eastern walkway is for pedestrians and bicycles during the weekdays and during daylight hours only, and the western walkway is open to bicyclists on weekday afternoons, weekends, and holidays.

It united three Boroughs of New York: Manhattan, the Bronx, and Queens. It remains the largest vertical-lift bridge in the world. It joins three giant bridges into one and consists of 13,500 feet of elevated viaduct and fourteen miles of roadway, all travelling over Randall's and Ward's Islands. Since its completion, the span length has been surpassed by eight other bridges. It still has the second longest suspension bridge main span in the United States, after the Verrazano Narrows Bridge in New York City.