midway geyser basin with grand prismatic spring and steaming excelsior pool, yellowstone national park, wyoming

aerial algae america american attraction basin beautiful blue boardwalk brown color colorful colour colourful crater deposits destination display elevation enjoy environment excelsior firehole forest geothermal geyser grand heat higher hike hiking hill hills hot landscape midway mountain national natural nature nearby opal opens orange outdoor outdoors park parks people prismatic river runoff spectrum spring springs states steam thermal top tourism tourist tourists travel travertine united view visible volcanic water waters west western wild wilderness wyoming yellowstone steaming pool USA