Jenna Dooley

Clyde Tombaugh, the man who discovered Pluto, grew up under the dark, open skies of the rural Midwest. Streator, Ill., where he once lived, has been full of celebration during NASA's flyby this week.

This year marks the centennial of America's first transcontinental road: the Lincoln Highway. You might have driven on the highway and not even known it, since it stretches from New York to California, passing through states like Iowa, Nebraska and Colorado, and carrying different state route numbers along the way.

...