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 .
Tallulah Gorge
The Tallulah Gorge is a gorge formed by the Tallulah River cutting through the Tallulah Dome rock formation. The gorge is approximately long and features rocky cliffs up to high. Through it, a series of falls known as Tallulah Falls drop a total of in one mile (1.6 km). Tallulah Falls is composed of six separate falls: l'Eau d'Or (), Tempesta (), Hurricane (the tallest at ), Oceana (), Bridal Veil (), and Lovers Leap (). The Tallulah Gorge is located next to the town of Tallulah Falls, Georgia. Tallulah Gorge State Park protects much of the gorge and its waterfalls. The gorge is one of the Seven Natural Wonders of Georgia.