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The original was posted on /r/todayilearned by /u/BezugssystemCH1903 on 2024-09-16 12:17:33+00:00.

Original Title: TIL the twin towns of Laufenburg, split by the High Rhine, built a bridge in 2004. Different sea level references—Mediterranean for Switzerland, North Sea for Germany—led to a 270 mm difference, which a sign error doubled to 540 mm in the middle of the bridge.