The Upside Down House
Designed by Daniel Czapiewski, and took over five folds longer to build than a usual home. Can be found in Poland and serves as a tourist attraction in a tiny town where tourists enter from a roof window at the ground floor. From there, visitors walk on the ceiling of the home, instead of the floor and gasps in the uniqueness of its reverse architecture and design.
Oh, did I ever mention everything else reversed? Yes it is!