Not far from the balcony, a large gilded mirror can be found on the fourth-floor corridor. Once upon a time, the mirror hid a secret passageway that would take anyone to Hogsmeade undetected at any time. Unfortunately, there was a cave in mid-way that made the passage end up not leading anywhere. Nevertheless, if you're in a pickle and can get the mirror off the wall and back again, you would at least have a neat hiding place.

Most people just try using the mirror to check on their appearance throughout the day. Oddly enough, however, the mirror doesn't show ones reflection. Always being shown in the mirror is a scene of handsome chandeliers, elegant landscape oil paintings, and golden draperies, which is not at all what the wall of the corridor behind you looks like. This is, of course, one of Hogwarts' many mysteries. The location of the room that the mirror is showing is unknown to everyone today. But every now and then, a dark figure can be spotted in the background before disappearing again.