This section examines the elements which constitute the architectural heritage. Cultural heritage contains various different values, such as historic, scientific, aesthetic, economic, quality of life, preservation of cultural identity. There are various problems threatening cultural heritage, such as natural ageing, atmospheric pollution, functions of modern cities, natural disasters, human destruction, economic mutations. Protection of historic cities should be encountered along with development planning and upgrading of the quality of life. Additionally, the restoration and reuse should be in compatibility with the historic shell. Protection of historic cities should include documentation and evaluation before the implementation of any intervention. It is important to establish a permanent local organization disposing professional knowledge, combining a continual exchange of ideas with residents. This organization should respect the particular historic, architectural and cultural characteristics of each city.