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[citation needed] 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.
The old site of Hotel Saville in
South Yarra,
Melbourne, now unofficially referred to as The Blocktagon, which was renovated into a residential dwelling made up of six octagonal apartments during the
eleventh season of reality show The Block.
At least 19 historic octagon houses are known to exist in Canada distributed across 4 eastern provinces.[1] For a list of these houses, See:
List of octagon houses. 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.
Convent of Christ (Tomar, Portugal), 12th-15th Century. The adjacent chapel is only one of two octagonal chapels in the world. The other is in Jerusalem.
Charola, Portuguese Info on the Chapel of the Convent of Christ.