Mammoth Hot Springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

travel destination photography horizontal colour image yellowstone national park unesco world heritage site wyoming united states of america north america day medium group of people steam tourist tourism walkway wood material men women rear view three quarter length non urban scene outdoors national park geology rock rock formation geothermal natural pattern extreme terrain hot spring nature leisure lifestyle awe looking at view railing casual clothing standing usa us united states american north american colour color image color outside travel destinations travel group the natural world unesco world heritage sites unesco world heritage site world heritage sites tourists holiday maker holiday makers on holiday