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 ...

Deep in the mountains of Phong Nha - Ke Bang National Park in Quang Binh Province, central Vietnam, small huts and cave ...

During the Vietnam War, North Vietnamese soldiers hid in caves from U.S. air strikes ... and a 30-foot drop test author Mark Jenkins at the forest shrouded entrance to Hang Son Doong.

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 ...

Photo from Getty Images / iStockphoto On a hot, humid day in northwestern Vietnam, a scaly creature with a “window” in its eyelids moved along the ground of the forest. Its remote home helped ...