They make majestic sights from afar, but it's only up close that you can really appreciate the majesty of great waterfalls, as the spray stings your face and gallons of rushing liquid thunder down with a noise like a thousand drummers. America's 58 national parks play host to some awe-inspiring examples, from the vast chute of Yosemite Falls, North America's highest waterfall, to the more manageable rapids at Brooks Falls, where brown bears congregate to fish for leaping salmon. Stunning, vertiginous, frozen in perpetual motion, these are among the parks' most breathtaking features.