Thang Long Citadel is a relic complex associated with the history of Thang Long Hanoi. This monumental construction was built by the kings during many historical periods and became the most important monument in the system of Vietnamese monuments.
The largest archaeological excavations in Vietnam and in Southeast Asia have revealed the traces of the Thang Long Imperial Citadel in the course of a 13-century history with monuments and cultural layers stacked on top of one another. .
The World Heritage Committee has approved a resolution recognizing Thang Long - Hanoi Center as the World Cultural Heritage.
This is the pride of not only Hanoi but also the country of Vietnam.
The picture below is Doan Mon:
Doan Mon is a dome door that leads into Kinh Thien. Doan Mon includes five gates built of stone. In 2002, Vietnamese archaeologists were allowed to dig inside Doan Mon to find the "old horse carriage" of the Tran dynasty. If unearthed, it will be possible to see the whole road from Doan Mon to Kinh Thien in the north and south west in Hanoi.