Results 1 results found Opal Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America Black Opal Pool, Hot Spring, Yellow Algae and Mineral Deposits, Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America Dead trees at Opalescent Pool with mineral deposits, Black Sand Basin, Yellowstone National Park, Wyoming, USA, North America Black Opal Pool in Biscuit Basin, Yellowstone National Park, Wyoming. Scenic view of Opal Pool, Yellowstone National Park, Wyoming, USA Opal Pool in Midway Geyser Basin, Yellowstone National Park, Wyoming
