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 .
Cumberland Falls
On average the falls, which flows over a resistant sandstone bed, is 68 feet (21 m) high and 125 feet (38 m) wide. Cumberland Falls is the second largest waterfall east of the Rocky Mountains, and the largest waterfall as measured by water volume in the Eastern United States, south of Niagara Falls. The falls divides the river into two sections, the Upper and Lower, or "below the falls" section.