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 ...

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 ...

This story appears in the January 2011 issue of National Geographic magazine. “Past the hand of dog, watch out for dinosaurs,” says a voice in the dark. I recognize Jonathan Sims’s clipped ...

Towering limestone cliffs? Check. Lush rainforest? Yes. Crowds? No. Likened to Halong Bay but inland, Trang An in Vietnam ...

Situated in Vietnam, the Son Doong Cave is a UNESCO ... Located in New Zealand, the Waitomo Glowworm Caves are famous for their bioluminescent worms that create a mesmerizing, starry light effect ...