Size: 258 sq. feet

Location: Barcelona, Spain

Photographer Christian Schallert tapped the talents of architect Barbara Appollini to redesign this tiny apartment into a space-saving pad. At first glance it looks like an empty cube, but once you open up the many wood-paneled shelves, the space turns into a fully-equipped home.

For example, Schallert's bed rolls out from underneath his balcony, and his bedside tables serve as stairs. The small home is so impeccably designed that it even stores a full refrigerator, dishwasher, and sink... all hidden in the wood paneling.