List of octagonal buildings and structures

Octagon buildings and structures are characterized by an octagonal plan form, whether a perfect geometric octagon or a regular eight-sided polygon with approximately equal sides.

The oldest known octagon-shaped building is the Tower of the Winds in Athens, Greece, which was constructed circa 300 B.C. Octagon houses were popularized in the United States in the mid-19th century and there are too many to list here, see instead List of octagon houses. There are also octagonal houses built in other times and cultures.

Below is a list of octagonal buildings and structures worldwide, excluding houses and windmills.

At least 19 historic octagon houses are known to exist in Canada distributed across 4 eastern provinces. In Canada, the octagon house craze also engendered an octagonal deadhouse phenomenon. This included octagonal deadhouses, pre-burial edifices, built in the mid to late 1800s along Yonge Street in south-central Ontario, from just north of Toronto to Aurora. At least 3 octagon houses are classified as heritage sites, one in Richmond Hill and the other in King. Extant octagon houses in Canada include the following:

...
Wikipedia