Hidden 4,000-year-old fortified town discovered in the Khaybar Oasis of Saudi ArabiaAl-Natah, occupied from 2400 to 1500 BCE, had about 500 residents and is the first of its kind for studying an ancient settlement in northwest Arabia. Wadi Disah, Al Shaq canyon of Saudi Arabia. (photo credit: Sergey-73 via Shutterstock)
