Group 2 68 warehouses were not used as dwellings, but today many have been converted into residential houses. Therefore, the preservation of the warehouse’s identity is a key aspect to preserve the landscape of Trondheim. Interestingly, the warehouses were repeatedly destroyed by fires and rebuilt always on the same sites and following the same construction rules established in the twentieth century. Nidaros Cathedral is the world’s northernmost important Gothic monument, and it is an important part of the city's identity: i.e., in the study of Kyttang and Bye (2019) the Cathedral was identified as the most significant historic building in Trondheim landscape. In this case, aspects like the colour, form, location and use are also of fundamental importance in the preservation of the city landscape. The interaction between nature and the urban fabric is evident. Monumental historical landmark buildings like the Cathedral dominate the urban landscape and thus shape the cityscape. Therefore, all new buildings should not break important landscape silhouettes. The case of Nidaros is representative of the fact that it is necessary to preserve the colour and above all the structure and shape because they are peculiar characteristics of the historical period in which it was built and part of the cityscape. Additionally, the air pollution situation in climate change has contributed to an accelerated deterioration of the monument. Therefore, it is necessary to think of some strategies to avoid irreversible damage and, at the same time, to keep the original materials and the identity of the Cathedral. These strategies, listed in the following subsections, concern architectural barriers, the use and maintenance of the historic building considered, and the proper maintenance of the green spaces. • Barriers The barriers in the city prevent free movement and make it difficult to use some spaces (Figure 1). It is important that the city has easy connections with the most emblematic sites and that there are spaces of utility and to further relationship between people. For this reason, certain obstacles such as different elevations, various vehicle and train crossings, etc. are complicating free movement. For example, the barriers between the warehouses were set up in order to prevent the spread of fire. And yet, in the cathedral, there is only one minor barrier, which is an outer fence with a gate, that allows people to get close to it (Figure 2).
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