the Grutas de Cacahuamilpa National Park in Mexico includes one of the largest cave systems in the world, with some openings wide enough to be used as concert halls?
the Cave of the Mounds’s many speleothems have earned it recognition as the “jewel box” of North American caves?
the Vercors Cave System contains the largest cave entrance in Europe?
the blind cave beetle Leptodirus hochenwartii, originally discovered in 1831 in the Postojna cave system, was the first animal to be recognized as a true cave dweller?
there have been at least fifteen deaths at the Welsh cave Porth yr Ogof in the last twenty years, all but one in the seven-metre-deep Resurgance Pool?
the Cave Bath of Miskolc, Hungary is an unusual thermal bath with low salt content, in a natural cave, that allows people to take a bath for a longer time?
the Blauhöhle in Germany's Swabian Alb is a huge cave system with more than 50-meter (164-feet) high caverns that can be accessed by diving through the Blautopf (pictured)?
Tung Hua Lin led a team that designed and built China's first twin-engine aircraft in a cave to avoid detection by the Japanese during World War II?
white nose syndrome has caused a mortality rate of over 90% of bats in some caves?
Eigenmannia vicentespelaea is the only known South American knifefish that exclusively inhabits caves?
a Vihara is an Indian Buddhist cave monastery that takes its name from the Sanskrit word for "a secluded place in which to walk"?
Charterhouse Cave is the deepest cave in Southern England?