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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. ==Australia== * Chinaman's Hat (Port Phillip), Victoria, an octagonal gazebo-like structure in the South Channel of Port Phillip Bay. * The Octagon Theatre at the University of Western Australia. * The old site of Hotel Saville (The Blocktagon) in South Yarra, Melbourne. The dwelling is now six octagonal apartments made as part of an Australian Renovation TV Series, The Block. The Braille Library Commercial Road Prahran Victoria 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of octagonal buildings and structures」の詳細全文を読む スポンサード リンク
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