I continue alone, following the beam of my headlamp along year-old footprints. A jungle inside a cave? A roof collapse long ago in Hang Son Doong let in light; plants thickly followed. As ...

We track through the jungle to a clearing, where he points up at a massive limestone wall. "Kopao," he says. Kopao is the Meakambut's most sacred cave. It is their creation cave, where they ...

Hang Son Doong is the world's largest known cave, with enough space in some of its passages to fly a Boeing 747 airplane ...

(AP Photo/Hiro Komae) ITOMAN, Okinawa (AP) -- Takamatsu Gushiken turns on a headtorch and enters a cave buried in Okinawa's jungle. He gently runs his fingers through the gravel until two pieces ...