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 .
Waterfalls of the North Fork Cascade River Valley
Johannesburg Falls, at , is a tall, low-volume cascade that falls vertically about from several small unnamed glaciers on Johannesburg Mountain. Its most prominent feature is its final vertical drop of . In overall height, it is the 19th tallest waterfall in the world.