The 1914 Prospect Park water tower is capped by a steep green-tile roof that gave it the nickname Witch's Hat. The surrounding park is public, but the tower interior is normally closed and traditionally opens only for a rare neighborhood event.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: minneapolisparks.org/parks-destinations/parks-lakes/tower_hill_park/