In the dank depths of Ellison’s Cave, you can find two of the deepest freefall pits in mainland US: Fantastic Pit, which ...

but did you know that Indiana has cave systems below ground too? Marengo Cave is Indiana’s most visited natural attraction ...

In 1968, at age 17, he uncovered a sinkhole in southern Door County that led to more than 1,700 feet of previously unknown underground passages now called Paradise Pit Cave. Today, he's a board ...