Wine cellars are a luxury most city dwellers don't expect to find in a home, but soon that might change. To make the amenity more accessible, one company is digging deep, literally. Spiral Cellars specialize in exactly what their name suggests—vertical wine cellars that are wrapped around a cylindrical opening beneath your floorboards. The design, created from engineered concrete, allows for the storage of 1,900 bottles of wine, without compromising on square footage.