This X shaped house hanging off a cliff outside Barcelona looks like what Tony Stark would live in. Designed by Spanish architecture firm Cadaval & Solà-Morales, the bad is two intersecting rectangular structures with four triangular recesses.

The front—the pièce de résistance—is made entirely of windows for an incredible view of the hills below. You'll want to check out more of it in the gallery below.

[Dezeen]