july 2, 2020 - yellowstone national park, wyoming: boardwalks in the hot spring travertine terraces in the mammoth hot springs

2020 area boardwalk boardwalks calcium carbonate colorful dead devils ecology environment geology geothermal geyser heat hike hot july landmark landscape limestone mammoth mineral national natural nature outdoors palette park pool rock scenery scenic sky spring springs steam terracces terrace terraces thermal thumb tourist tourists travel travertine view volcanic volcano water wyoming yellow yellowstone