During the Vietnam War, North Vietnamese soldiers hid in caves from U.S. air strikes ... V with a foot-deep trench of water at the bottom. Mud walls, sticky as peanut butter, rise 40 feet high ...

A surprising discovery was made in Lèn Chùa cave, located in Nghĩa Thành commune of Nghĩa Đàn district, Nghệ An province, Vietnam. Local resident Phạm Trịnh Tiến stumbled upon human ...

The group spent four days wading through hip-high waters before traversing through and camping in soaring caves. At the end of Hang Son Doong stood the Great Wall of Vietnam, a 200-foot barrier to ...

Take an otherworldly journey through Hang Son Doong, the world's largest cave located in Vietnam. The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan ...

Related: China's 'heavenly pits': The giant sinkholes that have ancient forests growing within Ho Khanh, a resident of ...