Thank you! We do have more pics, but they aren't online yet. The walls behind the stonework are concrete block finished with white stucco on the interior, the ceiling is vaulted brick inside with a poured concrete top, and the floor is bluestone flagging over crushed stone for drainage of condensation. It has two vents for air movement, and the stone shelves on the front eventually became supports for beam pockets for a timber frame roof system extending from the house to the root cellar. The lintel over the door was split off a huge boulder found in the nearby woods.