Hang Son Doong is the world's largest known cave, with enough space in some of its passages to fly a Boeing 747 airplane through them. The limestone cavern sits beneath a lush jungle in Vietnam's ...

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 get a signal. There’s no way to ...

A jungle inside a cave? A roof collapse long ago in Hang Son Doong let in light; plants thickly followed. As “Sweeny” Sewell climbs to the surface, hikers struggle through the wryly named ...

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 ...

Hang Son Doong, the world's largest cave in Vietnam, was discovered in 1990 and is a breathtaking natural wonder. Formed over millions of years, this massive cave features towering stalagmites ...

The Extremes crew had trekked for two days through steep valleys covered in lush jungle to reach Hang son Doong ... Veteran cave explorer and safety advisor Tim Fogg takes in the view of a lifetime.