Berlin Customs Wall

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The Berlin Customs Wall (German: "Berliner Zoll- und Akzisemauer", literally Berlin customs and excise wall ^[1]) was a ring wall around the historic city of Berlin, between 1737 and 1860; the wall itself had no defence function but was used to facilitate the levying of taxes on the import and export of goods (tariffs), which was the primary income of many cities at the time.