 Lakeshore Geyser in the West Thumb Geyser Basin in Yellowstone National Park |
 Fishing Cone in Yellowstone Lake in the West Thumb Geyser Basin in Yellowstone National Park |
 Bluebell (front) and Seismograph Pools in the West Thumb Geyser Basin in Yellowstone National Park |
 Black Pool in the West Thumb Geyser Basin in Yellowstone National Park |
 Looking into Black Pool in the West Thumb Geyser Basin in Yellowstone National Park |
 Big Cone in the West Thumb Geyser Basin in Yellowstone National Park |
 Close up of the Abyss Pool in the West Thumb Geyser Basin in Yellowstone National Park |
 The Abyss Pool at West Thumb Geyser Basin in Yellowstone National Park |
 Percolating Spring in the West Thumb Geyser Basin in Yellowstone National Park |
 Collapsing Pool in the West Thumb Geyser Basin in Yellowstone National Park |
 Mud pool in the Thumb Paint Pots section of West Thumb Geyser Basin in Yellowstone National Park |
 Bubble about to burst in Thumb Paint Pots at West Thumb Geyser Basin in Yellowstone National Park |
 Ledge Spring in the West Thumb Geyser Basin in Yellowstone National Park |
 Surging Spring in the West Thumb Geyser Basin in Yellowstone National Park |
 Mimulus Pool in the West Thumb Geyser Basin in Yellowstone National Park |
 Lower Yellowstone Falls (308 ft) in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Yellowstone Falls in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Close up of Lower Yellowstone Falls (308 ft) in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Lower Yellowstone Falls in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Dead tree polished by nature in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Upper Yellowstone Falls (109 ft) in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 A cascading falls in the Grand Canyon of the Yellowstone in Yellowstone National Park |
 Boiling mud pool at the Sulphur Caldron in Yellowstone National Park |
 Harebell wildflowers at the Sulphur Caldron in Yellowstone National Park |
 Delicate mud bubbles float on a pool in the Sulphur Caldron in Yellowstone National Park |
 Bison rests near a crater of boiling mud at the Sulphur Caldron in Yellowstone National Park |
 Boiling mud pool at the Sulphur Caldron in Yellowstone National Park |
 Bison rests at the Sulphur Caldron in Yellowstone National Park |
 Sizzling Basin in the Mud Volcano area of Yellowstone National Park |
 The Mud Volcano in the Mud Volcano area of Yellowstone National Park |
 Stick and plants on the edge of a boiling pool in the Mud Volcano area of Yellowstone National Park |
 Overview of the Churning Caldron in the Mud Volcano area of Yellowstone National Park |
 Mud geyser of the Churning Caldron in the Mud Volcano area of Yellowstone National Park |
 Churning Caldron in the Mud Volcano area of Yellowstone National Park |
 Sour Lake in the Mud Volcano area of Yellowstone National Park |
 Bison in the Mud Volcano area of Yellowstone National Park |
 Plants in a boiling pool in the Mud Volcano area of Yellowstone National Park |
 Dragon’s Mouth Spring roars in the Mud Volcano area of Yellowstone National Park |
 Steaming pools across the Yellowstone River from the Mud Volcano area of Yellowstone National Park |
 Bison rests next to a steaming pool across the Yellowstone River from the Mud Volcano area of Yellowstone National Park |