There was actually an old brick chimney that was behind an enclosed wall.
It was extremely messy! I think some of that dust is still floating around even though we sealed the kitchen off from the rest of the house!
And now, 2 years later our kitchen looks like this...
We created this opening into our dining room with a breakfast bar and I LOVE it...it is definitely my favorite part of our kitchen and the area we use most! It was just a small doorway before.