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 .
Darwin Falls
Darwin Falls is a waterfall located on the western edge of Death Valley National Park near the settlement of Panamint Springs, California. Although there exists a similarly named Darwin Falls Wilderness adjacent to the falls, the falls themselves are located in and administered by Death Valley National Park and the National Park Service. There are several falls, but they are mainly divided into the upper and lower with a small grotto in between. At a combined 80 feet (24 m), it is the highest waterfall in the park. The canyon is walled by dramatic plutonic rock.