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The Imperial City of Hue, also known as the Citadel, is a large complex located in Hue, Vietnam. It was once the political and cultural center of the Nguyen Dynasty, which ruled Vietnam from 1802 to 1945. Today, the Imperial City is a popular tourist destination, known for its beautiful architecture, rich history, and cultural significance. The Imperial City was constructed in the early 19th century, during the reign of Emperor Gia Long. It took over 30 years to complete, with work continuing under successive rulers. The complex covers an area of 520 hectares, with walls that are 10 meters high and 21 meters thick, surrounded by a moat that is 30 meters wide. The main entrance is through the Ngo Mon Gate, which is decorated with intricate carvings and elaborate roof details. Inside the Citadel, there are numerous buildings, including palaces, temples, and administrative offices. These structures are arranged in a series of courtyards and gardens, each with its own unique design and purpose. Some of the most notable buildings include the Thai Hoa Palace, which was used for important ceremonies and official receptions, and the Forbidden Purple City, which was the private residence of the Emperor and his family. The architecture of the Imperial City is a blend of traditional Vietnamese and French styles, reflecting the influences of both cultures during the time of its construction. The buildings are characterized by their colorful roofs, ornate carvings, and intricate details, including dragon motifs and depictions of mythical creatures. The Imperial City of Hue is also known for its cultural significance. It was the site of many important events in Vietnamese history, including the coronation of emperors and the signing of important treaties. The complex was heavily damaged during the Vietnam War, but many of the buildings have since been restored, making it a must-see destination for visitors to Vietnam.