The Armour–Stiner House in Irvington, New York, is an exceptionally rare Victorian residence and the only known fully domed octagonal house. Built in 1859–1860 for financier Paul J. Armour on ideas popularized by Orson Squire Fowler, it was greatly enlarged between 1872 and 1876 by tea importer Joseph Stiner, who added its dramatic dome and lavish interiors. Modeled in part on Bramante’s Tempietto, the four-story house combines octagonal planning, elaborate ornament, and a prominent hilltop setting above the Hudson River. Saved from demolition in 1976 and carefully restored, it remains one of the most distinctive and best-preserved octagon houses in America.