Highlights of the five-night trip include seeing the cave’s own rainforest and a calcite wall called the Great Wall of Vietnam. Vietnam is home to the world's largest cave. It's so vast that it has ...

A group of five Italian scuba divers died while exploring a deep underwater cave near Vaavu Atoll. No one knows what happened ...

Forbes contributors publish independent expert analyses and insights. Located in central Kentucky, Mammoth Cave is the world’s longest known cave system with more than 400 miles (over 640 kilometers) ...

Every evening, millions of bats swarm out of a single cave in Texas, making it one of the most stunning natural phenomena to witness. The colony is so huge that it turns the sky black as they begin ...