My place is adjacent to one of the Federal Refuges along KY Lake. When the lake was built, all the landowners were bought out and their home-places abandoned. I've checked out several of the old homesites. One even still had the chimney standing. However, the oddest one was a well or cistern I found above a home site on the edge of the river bottomlands. The house site is just a few feet above the level of the bottomlands, but about 100 feet above the old house - on the side of a very steep hill - I found an 18" wide brick circle. Looking into it, it appeared to be an old well or cistern.
I don't know anything about the old ways of building wells/cisterns, but why would you build one on the side of a very steep hill, 100 feet higher than the house? That has puzzled ever since I found it.