Eight years ago, on May 19, 2016, the heritage “Poetry and Literature on Hue Royal Architecture” (1802 - 1945) was recognized as a World Documentary Heritage in the Asia-Pacific region by the UNESCO Memory of the World Committee for Asia and the Pacific (MOWCAP).

With unique and significant values in terms of form and informational content, "The Engravings on the Nine Dynastic Urns of Hue Imperial Citadel" was recognized by UNESCO as a Documentary Heritage in the Asia-Pacific region's Memory of the World Program on May 8th. This marks Hue's fourth UNESCO-listed documentary heritage.

At 13:09 on May 8th (local time), in the capital city of Ulaanbaatar, Mongolia, Vietnam's dossier "Bronze castings on the Nine Dynastic Urns at the Imperial Citadel of Hue" was approved and officially became a documentary heritage of UNESCO's Memory of the World Programme for the Asia-Pacific Region.

Among many mausoleums of the Nguyen Dynasty, recognized by the UNESCO as a World Cultural Heritage in 1993, Emperor Gia Long's mausoleum is a magnificent painting of the coordination between nature and architecture; in which, nature is the main factor creating the grandeur of the architectural structure.