According to Alemi and Stevenson, in models of the early solar system it is nearly impossible for Venus to avoid a big hit. Most likely, Venus was slammed early on and gained a moon from the resulting debris.
The Golden Gate Bridge was built simply, to connect San Francisco to Marin County. The San Francisco Bay has rough currents and ferries were the only way to get across. Building a bridge just made it easier.
The Golden Gate Bridge (San Francisco, California) is an example of steel used in close proximity to saltwater. The Golden Gate Bridge is one of the world's great bridges. It spans 2.7 kilometers across the Golden Gate Strait at the end of San Francisco Bay. More than 1.5 billion cars have crossed over it.