Hitting rock bottom is generally not a gratifying experience. But when I reached the Colorado River at the base of the Grand Canyon after two days of hiking, I was elated: Less than one percent of all visitors to the Grand Canyon ever see more than its rim. I set down my pack and felt as though I had made it to the moon. Then I promptly fell asleep on a picnic table with my boots on.
http://blogs.nationalgeographic.com/blogs/intelligenttravel/2010/09/rim-to-rim-hiking-the-grand-ca.html?source=link_tw09082010l