: Co Loa Citadel & An Duong Vuong Temple
Co Loa Citadel is perhaps the most ancient citadel in Viet Nam. It was built by Thuc An Duong Vuong in the 3rd century BC to be the capital of Au Lac Kingdom (the name of Viet Nam at the time). It was built according to a helical design and was surrounded by three ramparts and a deep moat.
The remains of the citadel are located on the same site where archaeologists have found tens of thousands of bronze arrowheads, iron axes, and animal bones. Close to the
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