Akzisemauer

The Berlin Customs Wall (German: "Berliner Zoll- und Akzisemauer" literally Berlin customs and excise wall ) 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.

The wall was erected after the old Berlin Fortress was demolished in 1734; the walls of the latter had already started to crumble and its military function was questionable. Frederick William I of Prussia ordered the construction of around the city which were completed in 1737 - the new ring fence incorporated the existing northern "palisade line" built in 1705. The location of this oldest stockade is recalled today by the street name "" (line street). Few parts of this original customs wall were stone-built.

The original customs wall had 14 city gates which were mostly named after the city to which the ensuing road led. Additionally, the river Spree was blocked with customs gates called "Oberbaum" (upper beam) and "Unterbaum" (lower beam) after the heavy tree trunks, covered in metal spikes, that were used as booms to block the river at night to prevent smuggling. The new wall engirded not only the city of Berlin and its suburbs but also encompassed some rural land in the east and south.

With the growth of Berlin, the stockades and gates were moved as dictated by circumstances during the following decades. Between 1786 and 1802 the wooden stockades were replaced by stone walls at a height of 4 metres. Also, various gates were rebuilt in an imposing style, one notable example being the Brandenburg Gate. In the middle of the century more gates were added to meet the increased transport requirements - these included New Gate (1832), Anhalt Gate (1839/1840), Köpenick Gate (1842) and Water Gate (1848).

The middle of the century was marked by new railway lines terminating in stations built in front of the wall usually near one of its gates. This was the case with Potsdam Station (1841), Anhalt Station (1842), Stettin Station (1842), Hamburg Station (1846) - only Frankfurt Station (1842) was built just inside the ring wall. An interconnecting railway line, the ("Berliner Verbindungsbahn") for goods and military transport, was built in 1851 linking the terminal stations and thus turning Berlin into a central transport hub for Prussia and the German Customs Union.

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