The Forbidden Purple City is a historical site located in Hue, Vietnam. It served as the imperial city for the Nguyen Dynasty from 1802 to 1945. The city is known for its unique architecture and layout, which includes palaces, temples, and gardens, all surrounded by walls and a moat. This site is part of the larger Imperial City of Hue, a UNESCO World Heritage Site. The Forbidden Purple City was reserved for the emperor and his family, making it a symbol of royal power and exclusivity. Today, it attracts visitors interested in Vietnamese history and culture.