Introduction: While forms of cities in Iran have been transformed from traditional structure into modern one, in the same line, the urban elements including squares changed and appeared in a totally new characteristic. Traditional squares in Iran have normally been vast open spaces enclosed with public traditional uses such as public baths, cisterns, mosques, bazars, palaces and governmental buildings. All of these squares have coherently been articulated with the city fabric for people. Since the first Pahlavi, urban fabric of Tehran, and accordingly its squares, has changed specifically for using cars or applying new modern infrastructures. Thus, from this time on in Tehran, two types of development overlays each other: The traditional layer consisting of organic and narrow roads and the modern layer with orthogonal and grid roads. To some extent, the same prototype has been followed in other big or small cities and settlements.The roundabouts or so-called modern squares emerged at the intersection of road networks across the cities. Therefore, the main usage and scale of these squares was defined for vehicular transportation. Around this new urban element at the crossroads some modern functions were emerged: municipality, post and telegraph office, hotels, banks, national police office, county authorities and province governor buildings which all were, less or more, relevant to the governmental uses. In the middle of the squares itself there was regularly either a statue of the first Pahlavi or any other urban landmark.