Khasi Memorial Stones (India)
The East Khasi Hills region of Meghalaya has a very large number of Memorial Stones set-up by the Khasi people.
The Khasi people were following their ancient Tribal traditions until a couple hundreds years ago, with Colonization and their conversion to Christianity. So this abandoned burial site that I noticed on the side of the road is probably not more than a few hundred years old. On the satellite photos, the area around those stones look like the traces of a village that was burned-out.
There are many similar abandoned burial sites with Monoliths all over the region. A few of them that have particularly high Menhirs are protected by a fence.
Those megaliths are not tombstones or graves but rather they are memorial monuments (Cenotaphs), raised in honor of the spirits of the Tribe elders.
I also noticed a large number of small square stone structures (about 20-30 cm side for the center hole).
From reading various old books about the Khasi people ancient funeral traditions, I believe that those square structures are small burial chamber, i.e. small boxes where the ashes of the dead were kept, temporarily before a big ceremony (that did not take place too often) where they were moved into a larger Cinerarium holding the remains of all the Tribe's elders. I believe that this is a cinerarium (or large burial chamber), i.e. basically a communal tomb.
Here are some books that have more information about the Khasi monoliths and memorial stones: