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The original was posted on /r/todayilearned by /u/TriviaDuchess on 2025-03-15 04:11:22+00:00.

Original Title: TIL that in 1857, New York City installed eleven 47-foot cast-iron fire lookout towers across the city. These towers were manned by volunteers as an early detection system to help protect a city largely built of wood. Today, only one remains, located in Marcus Garvey Park in Harlem.