Calls to prayer, busy markets, and noisy camels are all part of walking through the Hejaz region of Saudi Arabia. Journalist and National Geographic Fellow Paul Salopek is retracing the migratory path of humankind, from its origins in Ethiopia to the tip of South America. Just as early humans did, he's making this epic journey on foot. Read Paul's article—the second in a series—online in National Geographic magazine: http://ngm.nationalgeographic.com/2014/07/hejaz-desert/salopek-text Follow Paul's Out of Eden walk: http://outofedenwalk.nationalgeographic.com VIDEOGRAPHERS: Paul Salopek, John Stanmeyer, and Mohamad Banounah EDITOR: Shannon Sanders