Octagon House

Octagon House - Credit: Wikimedia Commons

The Octagon House, also known as May's Folly, is a historic octagon house at 527 1st Avenue in Columbus, Georgia. Built about 1830 and enlarged in 1863, it is claimed by the local historical society to be the nation's only known example of a double-octagon house. It was declared a National Historic Landmark in 1973. and Read more on Wikipedia

type: NRHP
date from: 1829

Source: en.wikipedia.org