Above is a family photograph taken near Grassflat, Pennsylvania over a decade ago.  We do not believe it was created through sunlight (such as lens flare), and its owner Steve believes there was nothing in the field that could have produced the light.  Camera flash reflection from that far away would have been impossible:

"... (taken in the) late 80's or early 90's, doorway in a field that was given to me by a friend of the family years ago.  It was one of many taken before their son went into the Navy.  It was dawn when he snapped pics of their horses, etc. and never saw the (10x20 foot?) doorway sitting in the grass with amazing bright, white light bursting thru it.  It's on the negative, as well.  This was in PA, I think.  Grassflat area? "