Octagon House - Credit: Wikimedia Commons
The Octagon House, also known as Zelotes Holmes House, is a historic octagonal house located in Laurens, South Carolina. Designed and built in 1859 to 1862 by the Rev. Zelotes Lee Holmes, a Presbyterian minister and teacher, it is thought to be the first concrete house erected in South Carolina. It was called the Zelotes Holmes House by the Historic American Buildings Survey. Read more on Wikipedia
Source: en.wikipedia.org