The largest octagonal house in the United States, topped by an onion-shaped dome and famously left unfinished when construction stopped during the Civil War. Visitors can tour the finished lower level and the raw upper stories, where building materials and structural framing remain exposed. Secondary source: https://visitmississippi.org/things-to-do/architecture/longwood/
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: natchezpilgrimage.com/year-round/longwood-circa-1860-1861/