Reader Alf writes:

These piles are located in Western North Carolina mountains.

I count 20 rock piles. 6 to 8 are still in good shape. Covered in moss and leaves and vegetation, the top center kind of sunk in or receded. The piles are about 3 feet tall and maybe 8 feet in diameter. Some of the piles seem to be in a line. The 20 piles cover a couple or maybe 3 acres of space.