According to Shan Jixiang, director of the Palace Museum, special lighting technology was employed to protect the wooden architecture and prevent the possibility of fires.
It is the first time the museum designed a night visit route for the general public.
The Forbidden City was China's imperial palace from 1420 to 1911. It became a publicly owned museum in 1925, and now houses 1.86 million cultural relics.
Its outer walls are about 3,400 meters long, with around three-quarters of them accessible to the public during the day.