The Grand Canyon is the biggest canyon on earth ... Meet some of the remarkable individuals who helped create America's national parks and the system that binds them together.

By the 1950s, amid the postwar economic boom and a renewed and growing interest in America’s national parks, more than a million visitors found their way to Grand Canyon each year ... being overruled ...

We may receive a commission on purchases made from links. Stretching more than 275 miles and sinking to depths of over 6,000 ...