Caves were discovered on the property in 1879, and that area later became Endless Caverns. There is more extensive information on the Internet about the recently updated caverns, and on the genealogy of the Zirkle family.
A few years ago I met a contractor who lived near the caverns who told me there was an abandoned field stone bank house on his property. I was immediately interested because my husband and I did some restoration on a similar house in Hillsboro, in Loudoun CountyVA, some years ago. (See my post Brushwashing, which included the faux stone fireplace.) He took me to see it-it's hidden and private-and it turned out to be very similar. Both houses had similar roots as well, Pennsylvania Quakers, who sure knew how to build to last.
I took photos of course, grateful to be a studio painter rather than Plein Aire. We have snakes, coyotes, and ticks, oh my.