The 155-mile-stretch (250 km) of Cu Chi Tunnels, which were used by Northern Vietnamese forces during the Vietnam War, are located north of Ho Chi Minh City. These tunnels served numerous functions; they were a hiding spot from enemies, places where families lived for extended periods, storage facilities, military command centers, and hospitals. If you wish, you may try to crawl into the tunnels, although you will be startled by how narrow they are. In recent years, some of the tunnels have been slightly enlarged to allow visitors easier access.