An Octagon House is a house that is built with its outer walls making the shape of an octagon, usually a regular octagon. This style was popular in the US and Canada in the 1850s, and there are still many octagon houses in existence. Several of them are called The Octagon House, so there is no single answer to the question.
The Octagon House was created in 1800.
Chickasaw Octagon House was created in 1871.
Russell Octagon House was created in 1859.
Jenkins Octagon House was created in 1855.
Sinnett Octagon House was created in 1855.
Prime-Octagon House was created in 1859.
Bradley Octagon House was created in 1906.
Estabrook Octagon House was created in 1853.
Shute Octagon House was created in 1855.
Rich-Twinn Octagon House was created in 1849.
Wallace-Jagdfeld Octagon House was created in 1860.
Deacon West Octagon House was created in 1856.