Armour–Stiner House - Credit: Wikimedia Commons
The Armour–Stiner House is an octagon-shaped and domed Victorian-style house located at 45 West Clinton Avenue in Irvington, in Westchester County, New York. It was designated a National Historic Landmark in 1976. and It is the only known fully domed octagonal residence. The house was modeled after Donato Bramante’s 1502 Tempietto in Rome, which in turn was based on a Tholos, a type of ancient classical temple. Read more on Wikipedia
Source: en.wikipedia.org