2007-2-3 2003-8-17 Yellowstone's world-famous natural history is marked by such colossal volcanic events that their reflections in today's landscape are difficult to grasp and impossible to take in at just a glance, even for those familiar with the signs of past volcanism. 152738 text/html 1.0 EN Yellowstone Island Park IdahoVolcano Largest calderas volcanic Activity Lava Flows. Yellowstone-Island Park Volcanoes text