Hang Tam Co, also known as the Cave of 8 Young Volunteers, is located at Km 16, Route 20 Quyet Thang, Tan Trach Commune, Bo Trach District, Quang Binh Province. This is part of the legendary Ho Chi Minh Trail (Truong Son Road), which was once the vital supply artery from the North to the South during the anti-American resistance war (1955-1975).
On November 14, 1972, eight young volunteers from Company 217, Division 559, originally from Hoang Hoa, Thanh Hoa, were filling bomb craters when they came under intense attack by American aircraft. To avoid the bombs, they ran into a nearby cave. Unfortunately, a bomb blast caused the cave entrance to collapse, trapping them behind a massive boulder. Despite relentless rescue efforts by their comrades, all eight sacrificed their lives inside the cave. The remains of the martyrs were only recovered in 1996 and buried in their home village.
Recognized as a National Historical Relic Site in 1988, Hang Tam Co has become a symbol of courage and patriotism, attracting thousands of visitors to offer incense and pay tribute.

Hang Tam Co is not only a historical relic but also famous for its mysterious spiritual stories. One of the memorable events occurred in 2009, during the 50th anniversary of the opening of the Truong Son Trail, when the sound of 'gecko, gecko' rang out exactly 8 times from inside the cave, moving everyone present. Locals also talk about strange occurrences, such as a wild banana tree in front of the cave producing exactly 8 bunches or a pair of geckos in the cave laying exactly 8 eggs. These stories enhance the spiritual attraction of Hang Tam Co, making it a sacred destination in Quang Binh.

