At the heart of the ancient city of Beijing lies the Forbidden City, the vast palace complex that was occupied by Chinese emperors from 1421 to 1911, during the mid-Ming and Qing dynasties. Once closed to outsiders—hence its name—the Forbidden City now serves as a museum and is one of the world’s most popular tourist attractions. In 1987, it was designated a UNESCO World Heritage site. The opulent complex consists of nearly 1,000 buildings with some 9,000 rooms. How long did it take to build? Discuss