Construction of the Hanging Lake rest area in Glenwood Canyon, part of the I-70 construction project. This photo was taken on June 27, 1994. The project completed Interstate 70's final, 12.5-mile gap in the transcontinental highway reaching from Baltimore, Maryland, to Interstate 15 south of Salt Lake City. "Lawsuits, environmental impact studies, and design changes took nearly two decades to resolve before the first shovelful of earth was turned...