Anyone interested in Vietnam's twentieth century history who's visiting Hue or Da Nang should definitely make a trip by the Demilitarized Zone, or the DMZ of Vietnam. There, visitors can still see Camp Carroll, one of the largest bases of the US Marine Corps; the Truong Son National Cemetery, which is the official Vietnamese war cemetery; the Vinh Moc Tunnels, where an entire village tried to wait out the war; and much more.