Passage in the Doan Mon, the main gate to the palatial complex of later Le Emperors in the Central Sector of the Imperial Citadel of Thang Long, Hanoi, Vietnam

arch doorway history asia passage arches walls historic archway tunnel hallway corridor world heritage site architectural interiors tunnels corridors southeast asia vietnam hallways building interiors vietnamese historical nobody indoors stone inside wall color image unesco unesco world heritage site hanoi no one no people indochina imperial citadel thang long central sector of the imperial citadel of thang long doan mon palatial complex central sector