Historically, Thang Long Imperial Palace has undergone many changes, but the center of the Citadel, especially the Forbidden City, is almost unchanged. Only the inside architecture had been built and repaired many times. This feature explains why on the 18 Hoang Dieu Archaeological Site, layers of architectural relics and relics are overlapping each other through historical periods. The relics are related and interconnected, forming a complicated complex but also very distinctive and attractive, clearly reflecting the relationship of urban planning and architectural space, also as a continuation of the dynasties in the history of the capital city of Thang Long. That is the outstanding and unique value of the center of Thang Long Imperial Citadel – Hanoi.

The central vestiges of Thang Long Royal Citadel – Hanoi covers an area of ​​20 hectares, including 18 Hoang Dieu archaeological sites and relics of Hanoi Citadel such as Hanoi Flag Tower, Doan Mon (Main Gate), Kinh Thien Palace, dragon house, D67 Revolutionary house and lady pavilion, northern gate.

This complex is surrounded by 4 roads: Phan Dinh Phung street in the north, Dien Bien Phu street in the south, Nguyen Tri Phuong street in the east and Hoang Dieu street in the west. When visiting the Thang Long Imperial Citadel, you will buy tickets at the gate 19C Hoang Dieu and start the visit here.