1. This Robert McElroy-designed treasure is on the market for the first time in 14 years.

Robert McElroy designed numerous homes in the Philadelphia region between the 1950s and 1970s. Some of his architectural hallmarks, including a spacious open floor plan, a diamond-shaped roof, vaulted ceilings, exposed beams, and expansive windows overlooking lush surroundings, are beautifully apparent in this four-bedroom residence, designed by the mid-century architect in 1965.