Class, this is a cemetery. Long ago, people would bury their dead in places like this and put up large stones to mark their locations.
There's writing on those stones.
Yes, people would leave messages on them telling about the deceased. Like "Edna Robinson, loving wife and mother". Or this one ... oh my god, that is so sad!
Why? What does it say?
Here lies Melvin Lee. Died one day before the discovery of the secret to immortality.