At first, it looks as though the woman in this video is opening a small door leading down into a basement, but then she flips up a hidden panel in the floor that reveals steps down and around the corner is a tiny, two-storey theatre that dates back to the mid-1800s sometime. As far as I can tell, a wealthy family who lived above the theatre — which is in Ragusa, in Sicily, and is known as the Teatro Donnafugata (Theatre of the Missing Woman) — had a private entrance built that led to their private balcony. Could be related to the nearby Castello Donnafugata, a royal palace that was built by a baron and has 122 rooms.