The Cu Chi Tunnels are a 250-kilometre network of underground passages constructed by Viet Cong guerrillas beneath the jungle northwest of Saigon during the Vietnam War. At their peak the tunnels housed thousands of fighters along with field hospitals, weapons factories, command centres, and kitchens - an entire functioning military infrastructure buried beneath a landscape that American forces controlled on the surface.
The tunnels were built by hand over two decades, beginning in the late 1940s during the resistance against French colonial forces and expanding dramatically through the 1960s. Today two sections of the network - Ben Dinh and Ben Duoc - are preserved as open-air museums, allowing visitors to walk the jungle paths, inspect the ingeniously disguised trap systems, and crawl through sections of the original tunnels.