At the Yellowstone National Park in USA.
Sequoia: Mineral King is a hidden valley up at feet reached by a winding road. It’s a trek, but you won’t be sorry when you get there—Mineral King is gorgeous.
Vernon Falls, Yosemite National Park, California, USA // Let's not let the corporations take them over.
Waterfalls in Rocky Mountain (Colorado) National Park - info about the various falls and hikes thereto. Wilderness Campsites and Backpacking.
Sequoia and Kings Canyon National Park itineraries - Sunset Magazine