This is a small cemetery hidden in the woods which hardly anybody even knows about. They are all old graves here. This grave from the 1800s was found there and apparently the coffin caved in. You can see what appears to be a hole in the earth.
In the 1800s, vaults were not used and coffins were made of wood. Some caved in after the wood rotted away. And no... no bones are seen in the hole. (less info)