My dream! "The Spiral Cellars design/build firm will dig a hole in whatever room you want your cellar in and haul the dirt right out the front door. In the remaining void they infill a spiral-staircase wine cellar.
Great idea for hiding guns in the house if you don't have a gun safe. Or even other items you want to keep safe! It took me a little while to understand this. The shelf unit slides behind a mirror. I thought it was a passage to a hidden room.