Petrified Forest National Park

Location: Arizona

Year Established: 1962

Area: 93,532.57 acres (378.5 km2)

Annual Visitors: 836,799

This portion of the Chinle Formation has a great concentration of 225-million-year-old petrified wood. The surrounding Painted Desert features eroded cliffs of wonderfully red-hued volcanic rock called bentonite. There are also dinosaur fossils and over 350 Native American sites.