Travertine calcite deposits, Minerva Terrace, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

america geo thermal geology geothermal hot springs landscape landscapes mammoth hot springs minerva terrace national parks natural world nature nobody north america outdoors physical geography steam steaming surface processes terrace terraces thermal thermal areas travel travel destinations travertine united states of america usa world heritage world heritage site wyoming yellowstone american americas outside us usa united states us wy