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 ...

Looking at photos online ... At the end of Hang Son Doong stood the Great Wall of Vietnam, a 200-foot barrier to be conquered by both ladder and rope climbing. In a cave there’s no way to ...

The world’s largest cave is over five miles long - so big that even a Boeing 747 could fit inside it. Hang Son Doong is in Phong Nha-Ke Bang National Park in Vietnam, near the border with Laos ...

The Extremes crew had trekked for two days through steep valleys covered in lush jungle to reach Hang son Doong cave. Set deep inside ... likening this otherworldly image to a view of outer ...