Canons used to guard the city from the fortifications at Skansen
At Nidareid, by the narrow isthmus between the river and the fjord, lies Skansen, where the remnants of the city fortifications towards the west can be seen. Today this is a park with a beautiful view of the fjord.
An aerial view of Trondheim, as seen on this map, shows that the Nid river forms a natural moat around the city centre (Midtbyen). In the sagas this was called Nidarneset - the Nidar headland. There is only one access road into the city centre and that is over Nidareid. There have been fortifications here since around 1170, originally a wooden fort with palisades. In the 1640s, fortified walls were added, the remains of which we can still see today. There was a city gate here from the Middle Ages right up until 1858.