Built in 336 A.D., Mogao Grottos is a destination also known as the Thousand-Buddha Grottos. This remote repository, housing one of the world's prime collections of Buddhist artwork and artifacts, rises up four stories in a cliff wall on Mingsha Hill. The murals have a combined length of over 4,800 feet and reach 150 feet high. Expect to see over 492 grottos consisting of 1,000-year-old murals interspersed with over 2,000 intricately hand-painted statues. The grottos also serve as a library of printed works of ancient texts and artwork that shows the influence of cultures from Iran, India, and Greco-Roman eras.