Emperor Citadel is located in Nhon Hau commune and Dap Da ward, An Nhon town, about 27km northwest of Quy Nhon. Emperor Citadel was built by Tay Son dynasty in 1776 on the basis of Do Ban citadel of Champa Kingdom and was officially named Emperor Citadel from 1778. During a long time from 1776 to 1793 , the citadel was the headquarters of the Tay Son army and then the capital of the central government of Emperor Thai Duc - Nguyen Nhac. Emperor Citadel was originally a rectangular architectural complex, consisting of three rounds: Outer Citadel, Inner Citadel and Forbidden City. The outer citadel has a circumference of 7400m.

The inner citadel, also known as the Imperial Citadel, has a rectangular shape of 430m long and 370m wide. Inside the Inner Citadel is the Forbidden City, which also has a rectangular shape of 174m, 126m wide. After the Tay Son dynasty failed, the Emperor Citadel - a vestige of a golden age of Tay Son was also demolished. On the old foundation of the citadel, the Nguyen Dynasty built a mausoleum to worship the two Nguyen Dynasty officials who died here, Vo Tanh and Ngo Tung Chau. This is a mausoleum with artistic style of the Nguyen Dynasty located in the complex of the monument. Recently, during the archaeological excavation, two semicircular lakes and many architectural vestiges of the Tay Son period in the Forbidden City area were discovered. The citadel was ranked a historical relic by the Ministry of Culture and Information in 1982.

In addition to the above relics, other monuments such as: Go Da Den, Ben Truong Trau, Bai Nhan - Tam Toa mountain, from Vo Van Dung street, from Bui Thi Xuan street,... are also relics associated with the city. Tay Son uprising movement, associated with pride in every Binh Dinh people.

Photo: Nguyễn Thị Quyên