Golden Gate Bridge in San Francisco

Engineering marvel, art deco icon, monument to progress: The Golden Gate Bridge does much more than connect San Francisco to Marin County. Named for the strait it spans -- the 3-mile passage between San Francisco Bay and the Pacific -- the bridge is a grand symbol of one of the world's most striking cities.

Completed in 1937, the $35 million structure of concrete and steel embodied a city's unquenchable spirit -- and, by extension, the nation's. Set off by its signature orange paint job, twin 750-foot towers that seem to disappear into the heavens and spidery cables that stretch like harp strings, the Golden Gate was unlike anything else ever built. At 4,200 feet, the main suspension span was easily the world's longest. (Almost 70 years later, it ranks seventh.) Facts and figures tell only a partial story: Admired as a practical feat, the bridge is beloved as a work of art, one of the greatest the 20th century produced in any medium. For more, go to sfvisitor.org