Which scenic spots in Beijing are free of charge?

Among the scenic spots in Beijing, only the Palace Museum is open to the police free of charge because the Palace Museum is a national museum and a key cultural relic protection unit. In order to ensure the safety of cultural relics and the protection of historical and cultural heritage, the policy of free opening is implemented for public servants such as the police, which is a special policy to thank the police and other people who have made contributions to the country and society.