Yellowstone National Park
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris are believed to have come from the park area itself as the central part of Yellowstone is the massive caldera of a supervolcano. The park contains 290 waterfalls of at least , the highest being the Lower Falls of the Yellowstone River at .
Colonial Creek Falls
According to the World Waterfall Database, it is the tallest waterfall in the continental United States, and is the 15th tallest in the world, exceeding the more renowned Yosemite Falls in height by 143 feet.