Ho Citadel is built out of stone only without mortar or glue in between slabs of stone. The citadel has rectangular shape of 900m long and 700m wide with four gates opening to the north, south, east and west. The original citadel was composed of La Thanh outside, then bamboo hedge, water moat and citadel wall. Stones used to built the citadel were exploited from Thanh Hoa Province and the transport of stone to the site, the raising of stones to the right position...were simply miraculous.