Snaking for 200 miles across the inhospitable terrain of southern Mongolia, the so-called Gobi Wall is the least studied section of a system of medieval fortifications that once extended from China into Mongolia. The Hebrew University of Jerusalem announced that a research team has recently completed a comprehensive investigation of the structure, combining remote sensing, pedestrian survey, and targeted excavations. The study revealed that the wall was primarily constructed from rammed earth, stone, and wood during the Xi Xia period (a.d. 1038-1227 ), a dynasty ruled by the Tungut tribes of western China and southern Mongolia. However, evidence showed that...