The Experience: Building the walls of Co Loa Citadel
Ngày 23 tháng 12 Năm 2020
Co Loa Citadel also known as "Thanh Oc or Loa Thanh" was built by An Duong Vuong in the early years of Au Lac Nation more than 2,000 years ago. Three walls of the citadel are covered with natural mounds.