Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

travel destination travel destinations travel photography colour colour image color color image horizontal horizontal image outdoors outside day nobody no one no one bacteria algae therophiles grand prismatic pool midway geyser basin yellowstone national park unesco unesco world heritage site world heritage site wyoming usa us united states united states of america north america american north american spring geyser geology geological geothermal national park landmark landmarks famous well known well known tourist destination non urban scene scenics scenic scene scenes scenery pool water steam heat runoff orange colour mineral earth tree forest nature natural