Apart from that, customs and historic background can be introduced to others by attracting visitors. There are many historical buildings or festivals which should be displayed to others, because it can represent how a country is enrich. To clarify, when tourists visit a historical site, they will notice how much local people like it and how preserve it carefully, so visitors will comprehend a nation has a strong background. For instance, there are many cities in Iran which are historic and have manifold monuments which have been built more that ten centuries, many foreign tourists visit them and take many photos to show them to their friends and families.