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The original was posted on /r/todayilearned by /u/New-Ranger-8960 on 2025-06-15 17:56:02+00:00.

Original Title: TIL that the Xerxes Canal in Greece was built around 480BC by Persian king Xerxes I to allow his fleet to safely bypass the dangerous waters around Mount Athos during his invasion of Greece, though much of it has eroded or been covered by farmland over the centuries.