Hue is the only capital city of the Vietnamese monarchy that remains today. The first wall, known as the Citadel of Hue, is built for the protection of al court activities. There are 10 entrances for access. The second walls around 2400m in circumference, was the offices where manarch and high-ranking mandarins came for daily work.

There are 4 antrances for access The third wall – Forbidden Purple City, about 1200m in circumfence , is private quarters of the Emperor and his family.