via Vietnam Plus, 11 November 2022:
The Son Tay ancient fortress citadel, covering 16 ha in Son Tay township 40km from Hanoi’s centre, not only bears historic value, but also catches attention for its unique architecture.
The site marks its 200 years of existence this year, with an official celebration slated for November 12 in a bid to raise the public awareness on heritage protection and preservation and stimulate tourism demand.
According to historical documents, Son Tay Citadel was built in 1822 during the reign of Minh Mang Emperor (1791-1841) under the Nguyen Dynasty. It was built entirely of laterite, a material that meets the requirements of a defensive building and was available in the locality.