Grave with a Window

A silly little stop in Vermont on one of our New England trips. New Haven was on the way to Shelburne & Burlington, so we figured why not.

It’s strange enough the grave is a mound, but….what’s that on top of it?

Some sort of window? Can you see in there?

…No. You can’t see anything.

There is no wording on the grave. It’s just a mound with a window in it.
Supposedly whoever this belongs to was afraid of the dark. At least that’s all I’ve heard.