The Ben Hai River, barely fifteen metres wide at its narrowest crossing, became the most militarized waterway on earth when the 1954 Geneva Accords drew the seventeenth parallel straight through Quang Tri Province. For two decades, this artificial border split Vietnam into competing ideologies, transforming fishing villages into artillery positions and rice paddies into free-fire zones. The Demilitarized Zone stretched five kilometres north and south of the river, yet by 1968 it hosted more than half a million troops, thousands of air sorties weekly, and an estimated forty thousand tonnes of ordnance dropped across its laterite hills. Today the scars remain visible: bomb craters filled with rainwater, rusted tank hulls half-buried in red clay, and concrete bunkers overtaken by elephant grass. A private DMZ tour from Hue covers roughly two hundred kilometres of Route 9 and Highway 1, linking sites that defined the war's northernmost theatre. Vinh Moc Tunnels, hand-dug through compacted clay between 1966 and 1967, sheltered three hundred villagers in a three-tier network eighteen metres below ground, complete with maternity wards, wells, and ventilation shafts concealed beneath shrub cover. Seventeen children were born underground; all survived. The tunnels opened to the public in 1994, and visitors now walk the same low-ceilinged galleries that once stored rice, ammunition, and families sleeping head-to-toe on bamboo platforms. Khe Sanh Combat Base, perched on a plateau forty kilometres west, endured seventy-seven days of siege in early 1968, absorbing more than ten thousand artillery shells daily. The airstrip that supplied the base under fire now hosts a small museum displaying deactivated ordnance, pilot helmets, and maps showing North Vietnamese trench lines that crept within five hundred metres of the perimeter wire. DMZ day trips from Hue typically depart at seven in the morning, allowing time to reach the former combat bases before midday heat blankets the coastal plain. The Hien Luong Bridge, painted half-yellow and half-blue until reunification, spans the Ben Hai River at the exact point where the parallel crossed; interpretive panels recount the families separated for two decades by a fifty-metre gap. Nearby, the Truong Son National Cemetery holds more than ten thousand graves arranged in concentric arcs on a hillside facing Laos, each white headstone bearing a name and home province. The route also includes the Rockpile, a karst outcrop that served as a forward observation post, and Dakrong Bridge, rebuilt five times after repeated destruction. Guided experiences emphasize primary-source accounts, connecting landscape features to specific operations documented in military archives and oral histories collected from survivors on both sides.