Two weeks ago I visited the incomparable Mogao Caves at Dunhuang, a UNESCO World Heritage site, located in Gansu province, northwestern China, at the edge of the Gobi and Taklamakan deserts, directly north of Tibet.  These caves remain one of the most well-preserved, splendid sanctuaries of sacred art in the world. Mogao Caves From the 3rd century BCE through the 12th century AD, Dunhuang was a prosperous oasis situated at the entrance to the Silk Road, where ancient caravans of Bactrian camels, donkeys, and horses carried cargo for more than 7,000 kilometers from China and Tibet through the...