The Cu Chi Tunnels are an in-ground defense system in Cu Chi District, 70 km northwest of Ho Chi Minh City. This system was dug up by the Viet Minh resistance forces and the National Liberation Front of South Vietnam during the Indochina War and the Vietnam War. The tunnel system consists of infirmary, many rooms, kitchen, storage, office, underground tunnel system, about 250 km long and ventilation systems located at the bushes. Cu Chi Tunnels were built at the end of the Ho Chi Minh Trail, on a land known as "steel land" to praise the resilient will of the people and army here. During the 1968 Tet Offensive, the Southern Liberation Army came from this tunnel system to attack Saigon.
               After the war, Cu Chi Tunnels became a national historical monument. In 2015, Cu Chi Tunnels Historical Site received the title of Labor Hero for its outstanding achievements in labor and creativity. In 20 years of operation, the relic has welcomed more than 20 million domestic and foreign visitors to visit and explore. On February 12, 2016, the site received a Special National Heritage Site certificate