Co Loa Citadel - Photo by Anh Nguyen

Co Loa Citadel is a fortified citadel featuring the ruins of an ancient imperial palace, temple and intricate walls. It is regarded as the most ancient citadel with largest size and highest scale, its design is also listed into the most unique citadel in Vietnam’s history of constructing ramparts during the old days. (Đông Anh, Hanoi, Vietnam)