A 1956 Plane Crash in the Grand Canyon Made Flying Safer for Americans

In 1956 two planes collided over the Arizona desert, killing all 128 people on board and scattering the debris deep inside the Grand Canyon. This week, the National Park Service designated the crash site a National Historic Landmark—even though they don't actually want you to go visit it. » 4/27/14 4:30pm 4/27/14 4:30pm