3 Cool Rooftop Penthouse ApartmentsWant views from your house? Try building it on top of a skyscraper. These three penthouse apartments give their residents the best views in town. Slideshow In Vienna, a dazzling penthouse by Delugan Meissl has boldly inserted itself between traditional rooftops of the city’s Wieden district like a recently landed alien intruder. Photo by Hertha Hurnaus.