Start your week-long trip in Thua Thien-Hue by exploring the famous Hue Citadel. This UNESCO World Heritage Site is a complex of royal palaces, temples, and gardens that served as the imperial capital of Vietnam during the Nguyen Dynasty. Spend the day wandering through the citadel's impressive architecture, including the Imperial City, Forbidden Purple City, and the Royal Tombs. Don't miss the chance to witness the Changing of the Guard ceremony at Ngo Mon Gate, a fascinating cultural experience.