The castle is conceived as a stronghold within the city, not just to defend against external incursions, but to withstand any internal rebellion, with the bridge as an escape route to the north, and then to Germany.
The bridge, a daring architectural work, consists of three large spans, the largest of which reaches 48 meters. At the time of its construction it was the largest span in Europe. The building is 120 meters long in total.
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