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 ...

Hang Sơn Đoòng in Vietnam is a surreal underground world featuring its own forest, river, misty clouds, and massive chambers ...

Tours to Son Doong cave in Quang Tri province, the world’s largest cave, are fully booked for 2026 and 2027, tour operator ...

A remote cave system nestled along the border of Greece and Albania has revealed what may be the largest known spider colony on Earth—and possibly the largest web ever documented. The discovery, made ...

In images that are sure to strike fear into any arachnophobe, a vast communal web that plays host to more than 100,000 ...

A rare bite into the past. The fossilized tooth of a newly discovered ancient shark species – dating back about 340 million years – has been unearthed in the world’s largest cave system, officials ...

An enormous limestone cave in Vietnam is the subject of a jaw-dropping new video that uses aerial drones to show its immense scale and beauty. Hang Son Doong is the world's largest cave, featuring a ...

Mammoth Cave, the world's longest known cave system, stretches 426 miles under Kentucky. The cave's limestone began forming 330 million years ago when the region was submerged under an ocean. Visitors ...

Arachnophobes look away now. Deep inside a pitch-black cave straddling the Albanian-Greek border, researchers have uncovered what may be the largest spider web ever recorded—teeming with more than 111 ...