Lower Yellowstone Falls Lower Yellowstone Falls Lower Yellowstone Falls from Artist's Point Hayden Valley Hayden Valley Hayden Valley Hayden Valley Great Blue Heron Elk Bull Bison Run-off Sizzling Basin Dragon's Mouth Spring Hot Spring Mud Volcano Steam Bath Sour Lake Mud Volcano Black Dragon's Cauldron Sour Lake Bull Bison Bull Bison Bison Lower Yellowstone Falls Lower Yellowstone Falls from Uncle Tom's Trail Lower Yellowstone Falls Grand Canyon of the Yellowstone Grand Canyon of the Yellowstone Grand Canyon of the Yellowstone Grand Canyon of the Yellowstone Lower Yellowstone Falls Lower Yellowstone Falls from Red Rock Point Lower Yellowstone Falls Lookout Point Trail to Red Rock Point Trail to Red Rock Point Upper Falls of the Yellowstone Upper Yellowstone Falls Yellowstone Upper Yellowstone Falls Brink of Upper Yellowstone Falls Upper Yellowstone Falls Brink of Upper Yellowstone Falls Upper Yellowstone Falls Yellowstone River