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The original was posted on /r/todayilearned by /u/Broad-Year-7205 on 2025-07-28 20:39:13+00:00.

Original Title: TIL that 17th‑century Persia built huge “pigeon towers” in order to generate a huge amount of fertiliser. Around the city of Isfahan, landlords constructed thousands of cylindrical mud‑brick towers whose only purpose was to attract wild pigeons. These cylindrical structures were purely for pigeons