The Palace Museum is also called the Forbidden City, which started to be built in 1407. It took 200,000 people fourteen years to build it. It was finished in 1420. There are 9,999 rooms in all the palaces. In China, nine is regarded as a lucky number traditionally. At present, it is free for Chinese students to visit every Tuesday.The Palace Museum has treasures of over 5,000 years' history.