Phong Nha

The Vietnam War is here. Hidden beneath the crushed limestone and the canopy of the forest lies an invisible enemy — you cannot walk its trails alone, or visit one of the caves, without risking being blown to bits. Phong Nha was the most heavily bombed site in Vietnam during the war: an estimated 19.3 million bombs were dropped by the US alone, and at least one third of them never exploded — they are still there, waiting.