Beijing's Palace Museum will be forbidden to visitors from August 22 to September 3, the museum's ticketing website shows and tourism industry sources confirmed Wednesday. Now limited to 80,000 visitors per day, the website for the museum more popularly known as the Forbidden City shows that no tickets are for sale beginning August 22. Tourism industry sources, speaking on condition of anonymity, confirmed to the Beijinger that the Forbidden City, the former home of China's Ming and Qing Dynasty emperors, is…