The aim of the present research paper is the analytical investigation of some basic quality characteristics of utopia. The term ''utopia'' was first used by Thomas More, in 1516, and it means the ''non place'' [ou + topos]. It refers to a meaning which through the centuries was expressed by a set of incongruous and diverging data, such as literary texts, architectural and urban planning designs, artistic manifesto, political strategies, social struggles, with the intention of analyzing the limits of each reality critically, to doubt the certainty of the ''present'' and to develop a new perception of life. Throughout history utopia has acquired many meanings. In the first section, the relationship of utopia and space is discussed and in particular with the meaning of the city with which it is deeply connected. The reasons why many utopians place their ideal systems in a contradictory environment to the existing one, why they describe a condition outside the real limits and why they search the ''other place'' are examined. In the second section, the relationship of utopia and time is examined. The transcendence of the existing is achieved by the utopians, through descriptions which refer to a future time. A purposeful distancing of the utopians from the present, the past and history is found. In the next section, what is examined is how a universal overhaul of society is made possible by one individual or one central power with the enforcement of totalitarian systems. The need for an overhaul of society acquires a political direction and the most important spokespersons of this need, were the utopian socialists of the 19th century, in addition to architects and urban planners of the modern movement in the 20th century.

Finally, the movement of the critical antiutopian, which gave birth to new terms like ''heterotopia'' which was introduced by Michel Foucault is presented. Heterotopias are spaces which are found in space, they include time and they bring out the other [hetero], in comparison and contrast to utopias. Heterotopias, we could say, are the realizable utopias of ''here and now''.