Designed by Frank Sinatra himself in 1961, this 3,200 square foot NYC penthouse belonged to the screen legend up until 1972. The Manhattan residence was dubbed a “glittering grotto in the sky” by artist Andy Warhol and features four bedrooms, six bathrooms, massive window treatments and two large terraces which wrap around the apartment to offer stunning panoramic views of the East River. Due to a large renovation in 2008, this incredible penthouse – listed at $6 million USD – now features a contemporary glass staircase, marble fireplace, and gourmet kitchen. Check it out below.