An elaborate network of excavations used by the Viet Cong during the Vietnam War, beneath the Cu Chi area there are about 75 miles worth of tunnels which have been preserved by the Government. Dug during the French occupation in the 1940s and expanded by the VC, the tunnels were instrumental to the war effort - used as hospitals, living quarters and a cache for food and weapons. and a communications and supplies route. Crawl through a section that has been slightly enlarged to get a feeling for what it was like for yourself.