I've also got another one for ya... my house has an attic space above the front porch. This attic space is separate from the rest of the attic (they are 90* to each other). The porch attic above the full attic was an addition to the house, so the original roof line is still there. Anyway, the floor space is about 6' x 8' up there, plywood floor, and fully insulated. To get access to this area, you need to push back a secret (not anymore) panel between the roof rafters (I think I'm using the right term - the 2x8's that go from the edge of roof to the top of the roof every 16"). This panel swings open, has batting insulation on it, and the piano hinge is completely hidden. Great part is, to get to this completely unmarked panel, you need to open a 2' x 2' door in one of my kids rooms that goes to the attic area.
We never even knew the space was there until about 2 years after living in the house and going into the attic this way. We felt a small draft where some of the insulation was sagging and I tried fixing it, only to find the wall moving!!! LOL Now, not only is the room hidden, but I have another small 'pocket' dug out with my important stuff up there. Course, if there's ever a fire I'm screwed... but nobody will ever find it!