If I had to guess, I would say the previous owner of this home was an avid gardener and this may have been an amazing shade garden in better days.
When we acquired the home it was a mess of weeds scattered with “behemoth” flagstones making several paths throughout. The paver path was now precarious.
A very generous friend helped me by moving the many heavy stones out of the garden so that the rest of the clean up could commence.
Now we have nice neat piles:
YAY! ready for some good shade grass seed!