The Forbidden City in Beijing served as the imperial palace for 24 emperors over 500 years. It was built between 1406 and 1420 on the orders of the Yongle Emperor, involving 10,000 artists and 1 million workers. Located in the center of Beijing within rectangular walls 10 meters high and a moat 52 meters wide, the 72 hectare palace grounds contain the largest and most complete ensemble of traditional Chinese architecture as well as over 900,000 artifacts from imperial dynasties. It now operates as an elaborate museum presenting China's court treasures through history.