In a low chamber inside, pigs amble across the ceiling. Two appear to be mating—unique for cave art, Ramli points out. Another, with a swollen belly, might be pregnant. He speculates that this ...

A mapping expedition in the Tlayócoc cave in Mexico led a professional cave explorer to a hidden chamber containing shocking ...

The Cussac cave is accessed by a narrow passage through boulders that have closed off its inner chambers for thousands of years. Lighting the way with headlamps, visitors cross vast chambers of ...