Imagine the surprise of young lumberjack, Ho Khanh, a native of Vietnam's then-sleepy Phong Nha township, when he saw enormous, ethereal columns of fog billowing out of the ground, like the earth ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: iStock A cave once known only to hunters and explorers is now helping to stabilize livelihoods for communities in ...

Divers in Mexico's Yucatan Peninsula say they have discovered the world's largest underwater cave. Underwater archaeologists discovered last week that the cave system known as Sac Actun, located near ...

Phong Nha-Kẻ Bàng National Park in Vietnam is billed as a successful example of sustainable tourism, with efforts to conserve the area’s unique caves and wildlife. The park’s management has ...