Hanoi, April 26 -- Quang Tri (VNA) - Five ancient stone axes believed to date back thousands of years have been discovered in En Cave within Phong Nha - Ke Bang National Park complex in central Vietnam, according to the Department of Culture, Sports and Tourism of Quang Tri province. These stone axes were subsequently presented to the Quang Tri Museum and the Hanoi Museum for research, preservation and display, contributing to promoting cultural and historical values of the Quang Tri land. Previously, an expedition team led by Dr. Howard Limbert, a British cave expert and member of the Royal British Cave Association, discovered the five stone axes in En Cave, one of the world's largest caves in Phong Nha-Ke Bang National Park. The artifac...