A house doesn't have to be haunted to be absolutely terrifying. Sometimes the design, not demons, will do all of the work. These homes from all over the world test the boundaries of gravity and balance while also being totally gorgeous examples of impressive architecture. Take a look and ask yourself you'd be brave enough to live in one. 1.) Cliff House, Calpe, Spain Fran Silvestre Arquitectos Reinforced concrete slabs help this angled abode stay situated in the rocks surrounding it. Covered in limestone stucco, the private home overlooks the Mediterranean Sea. 2.) Sky High Treehouse, France Elle Decor Near...