BEIJING, Oct. 8 (Xinhuanet) -- Aerial photography has helped shed new light on the capital of Kublai Khan's empire, also known as Xuanadu in Marco Polo's Travel Notes. The description of the metropolis Shangdu (Xuanadu) by Marco Polo some 700 years ago has somewhat been confirmed by aerial photography, Yang Lin, director of the center of remote sensing and aerial photography of China's National Museum, told Xinhua on Saturday. "We can see the spectacular city with its scale and the density of buildings," Yang said. The ruins have been overgrown with grass for more than 600 years. Archaeologists have taken...