Further to earlier answers, now that you have found out what is there, I'd be inlcined to cover it back up again. Why? Because it is in the wrong place now that there is a wall immediately adjacent.
Perhaps taking the wall out is another option! If you were to do that, a nice Victorian combination would finish the job off nicely, but leaving the fireplace as is - i.e. a brick opening in an odd place is the worst solution IMHO.
Manks
Perhaps taking the wall out is another option! If you were to do that, a nice Victorian combination would finish the job off nicely, but leaving the fireplace as is - i.e. a brick opening in an odd place is the worst solution IMHO.
Manks