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St. Gereon's Basilica features one of the most unusual domes in medieval architecture — a decagonal (ten-sided) structure completed in 1227 that was the largest free-standing dome north of the Alps until modern times.
Built over a late-Roman cemetery church honoring St. Gereon and fellow martyrs of the Theban Legion. The decagonal extension was added in the 13th century. Severely damaged in 1944, it was rebuilt by 1985.