Mammoth Cave National Park was established on July 1, 1941, designated a World Heritage Site in 1981 and became an Inter ...

Flickr/James St. John The 1842 Tuberculosis Hospital in Mammoth Cave Dr. John Croghan bought Mammoth Cave in 1839 for $10,000 ...

54.Hackers can crack a so-so password instantly, but a really strong one can take millions (yes, millions) of years to crack.