The Imperial Citadel has 4 doors arranged on 4 sides, of which the main door (in the south) is Ngo Mon. Relics inside the Imperial Citadel include Ngo Mon Gate, Thai Hoa Palace and Dai Trieu Nghi Courtyard, Dien Tho Palace, Truong Sanh Palace, Hung To Temple, Trieu To Mieu, Thai To Mieu, Hien Lam Cac, Cuu Dinh, and Phung Tien Palace.