The presenter said he's been in every known cave on the Peninsula, discovering one of them as a 17-year-old in 1968.

Sótano de las Golondrinas, or Cave of Swallows, is the largest pit cave in the world — an over 1,200-foot drop from top to bottom. It's also home to thousands of birds, who spiral out of the ...

Horseshoe Bay Cave, located under Frank E. Murphy Park in Egg Harbor, stretches over 3,103 feet, having been carved into the ...

One such drop is known as Fantastic Pit within Ellison’s Cave. It is the deepest freefall pit in America, plunging down vertically for 179 meters (586 feet). Within the same system is Incredible ...

Also called "dikengyuan" in Mandarin, which means "pit courtyards," the homes are a type of cave dwelling ("yaodong") commonly found in the Loess Plateau in northern China. "Academic literature ...

The cave, located in the separatist region of Abkhazia ... But finally, on October 19, Kasjan dropped down a pit later dubbed Millennium and looked at his altimeter. He had passed the 2,000 ...