Spreading across Long Valley in California, the Volcanic Tablelands are a vast and unique landscape formed 700,000 years ago. Small canyons and bluffs dot the mostly flat area, offering amazing night sky views. Carved into the gray, red and pink rocks are extraordinary petroglyphs, mysterious symbols created by Native Americans centuries ago. Archaeologists can only speculate on their meaning. Photo of Bureau of Land Management site by Brandon Yoshizawa (www.sharetheexperience.org).