Thang Long City is an ancient imperial city built in Hanoi, Vietnam, in 1010. First built by the Chinese Tang Dynasty during the Zhao regime in Vietnam, it was then reconstructed by the Nguyen Dynasty, which was the founder of Vietnam. One of the most important structures in the history of VietNam, Thang Long Imperial Citadel used to be home to the Vietnamese royal palace and government agencies, as well as the venue for several important ceremonies and official events. The style architecture of the Imperial City at the time is the strictly East Asian palace style, which amalgamates into three cultural elements of Vietnam, China, and France. It comprises many large buildings and gardens, including palaces, temples, libraries, the most excerpt of such being the Lookout Tower (Hậu Lâu) and the Green Gate (Cửa Bắc). Thang Long Imperial Citadel was attributed the status of World Cultural Heritage by UNESCO in 2010. Still today, Thang Long Imperial City has become an important tourist attraction in Vietnam, with thousands of domestic and foreign tourists coming here every year. Visitors can appreciate the beauty of the ancient buildings in the City, learn about Vietnamese history and culture, and participate in various artistic performances and handicraft exhibitions.