Golden Gate Bridge
In 1916, San Francisco's city engineer asked other engineers to offer ideas for a bridge. One man, Joseph Strauss, designed a very cheap bridge - only $17 million, but many thought it was ugly.  Local authorities asked him to change the design and to work with other experts.  He agreed.  He and other experts, especially architect Irving Morrow, designed the bridge again, this time as a suspension bridge.  A suspension bridge has tall towers that hold long cables, and the cables hold up or "suspend" the bridge.