Mulu’s Sarawak Chamber

Deep in Borneo, in Gunung Mulu National Park, is the largest cave CHAMBER in the world by area, the Sarawak Chamber, big enough to hold dozens of jumbo jets, and the Deer Cave, whose mouth is among the largest cave entrances anywhere and from which three million bats pour out each evening in a river of wings. A UNESCO World Heritage site. PUBLIC show caves (the Sarawak Chamber itself is expedition-only), Malaysia.