the emperor's reading room (thai binh lau) inside the hue royal citadel imperial city, vietnam

architectural architecture asia asian attraction binh blue building bình citadel city culture east eastern emperor famous forbidden heritage historic historical history hoàng hue huế imperial kinh landmark lau library lâu nội old palace reading room royal sightseeing site sky south southeast thai thanh thành thái tourism tourist touristic unesco vietnam vietnamese world đại