In the paper are analyzed the criteria that influence the financial and cultural value of the historical and architectural monuments, as well as the influence given by their uniqueness. The paper synthesizes the researches made by the author in the evaluation domain, and mainly in the evaluation of the historical properties, using two methods: the replacement value method and the comparison method.When analyzing such properties, the evaluators must be aware of the financial and cultural value of the historical buildings, and the potential negative influence given by the augmentation of their financial and cultural values, as well as the consequences of some intervention measures. This is the reason why the evaluators must identify and inspect the historical buildings in the process of evaluation, so that their financial, cultural, architectural and historical interest can count, including any intervention of protection, in determining the value of the building and the requirement of intervention measures.The notion of historical monument includes both the architectural conception and the urban or rural settlement that show evidence of a certain civilization, of a significant evolution, or a historical event. Therewith, the notion of historical monument extends also on small works that over time acquired a cultural signification.