No pics, but unless it is booked in advance for a private affair, you just ask to be seated in there when you get to the CG. Sometime, if CG isn't really busy, the room is closed.
Nothing very special about it except they store some of thier wine in there--hence the name. The view is NOT a MK view. The main attraction is that it is somewhat removed from the general hustle and bustle of the main CG dining room.
We never ask for it, but have been seated in there (at random) at least 3 times.