Travel The world’s only fully-domed octagonal house is now open for tours in New York April 23, 2019Karen Croke, Rockland/Westchester Journal NewsComments Off on The world’s only fully-domed octagonal house is now open for tours in New York Irvington's fully restored Armour-Stiner Octagon House was built in the 1860s to resemble a 16th century Roman Temple.