Grand Canyon National Park

Grand Canyon National Park

Cast Of Thousands Keeps Grand Canyon Humming

Grand Canyon National Park may be one of the planet's Seven Natural Wonders, but few realize how many people it takes to keep the 4.4 million annual park visitors safe, fed and happy.

For Casey Murph, who manages mule operations on the south rim of the Grand Canyon, the day starts well before sunrise. Beginning at about 4:30 each morning, he goes over the day's schedule, sets out buckets of oats for the mules and opens up the tack rooms in a huge, surprisingly clean 101-year-old barn.