Eruv
As in other cities with large Jewish communities, Antwerp is surrounded by a wire called "eruv" (Eiroew in Dutch). Different from the eruvs in New York or other large sities, the Antwerp eruv surrounds the whole city center. The presence of this eruv allows Jews to interpret the city as one big house, making it easier to avoid breaking some Sabbath regulations within it. The wire constituting the eruv can be found close to the Singel at a height of 6 meters, and at the entrance of the Diamond district.
Read more about this topic: History Of The Jews In Antwerp