yellowstone national park, midway geyser basin, detail of grand prismatic spring, wyoming, united states

algae america american attraction basin beautiful becomes blue boardwalk color colorful colour colourful deposits destination detail excelsior firehole forest geothermal geyser grand heat hot landscape midway mountain national natural nature of orange outdoor outdoors panorama park parks people prismatic river runoff snow spectrum spring springs states steam striking thermal top tourism tourist tourists travel travertine trees united usa view visible volcanic water waters west western wild wilderness wyoming yellowstone