Thanh Hoang De: The Imperial Citadel of Dual Dynasties in Quy Nhon - Local Info | Quy Nhon forum: Thanh Hoang De (The Imperial Citadel) stands as a vital historical landmark in Quy Nhon, Vietnam, capturing the unique fusion of two major… #QuyNhon #ThanhHoangDe #DiTichLichSu #Champa #TaySon