Bill Gaure, maintenance worker on the Golden Gate Bridge in San Francisco, nears the top of the north tower after nearly a half-mile uphill hike from the center of the span, May 15, 1952. In the background, at center, is a residential area of San Francisco, and at upper left is part of the Presidio. The bridge was built right where the Pacific Ocean and San Francisco Bay meet. (AP Photo/Ernest K. Bennett)