Outdoor, Trees, Wood, Large, Slope, Concrete, Side Yard, Back Yard, Wire, Woodland, Horizontal, and Metal Inspired by the surrounding landscape of chestnut trees, rocky hillside, and bubbling stream, Portuguese architecture firm 3r Ernesto Pereira chose to blend into, and take advantage of, the local geography rather than fight against it at this sleek, modern home near the coastal city of Porto. At a cost of €100,000 (approximately $125,000) and measuring about 140 square meters, this stunning, wood-and-glass retreat took about four months to construct.   Best Outdoor Metal Back Yard Photos from 50 Jaw-Dropping Glass Houses That Shatter Expectations