Archaeologists have discovered a mysterious 4,000-year-old fortified settlement in Saudi Arabia , which they say reveals details of the region's shift from a nomadic lifestyle to an urban existence. The remains of the town, which dates back to the early Bronze Age, were found in Khaybar, an oasis in the Medina Province. The long-lost town, named al-Natah, was hidden by the walled oasis, made of fertile land surrounded by desert area, according to a new study. A team of French-Saudi researchers