From the National Park Service website:
A "Wonderland of Rocks" is waiting for you to explore at Chiricahua National Monument. The 8-mile paved scenic drive and 17-miles of day-use hiking trails provide opportunities to discover the beauty, natural sounds, and inhabitants of this 11,985 acre site. Visit the Faraway Ranch Historic District to discover more about the people who have called this area home.
I'm looking at the hoodoos (rock pillars) of Chiricahua National Monument from the Massai overlook, about 7000 ft (2100 m). The hoodoos' rock is volcanic rhyolite tuff that has been eroded down over the ages.
The monument is in the Chiricahua Mountains of southeastern Arizona, USA, about 115 m (200 km) east of Tucson.