Abstract : Bucharest's civic center is the main subjetc studied in detail in this thesis. It becomes gradually the base point which allows us to draw parallels and comparisons with other projects built up under the totalitarian regime. The direct comparisons of various architectural answers enabled us to highlight common points between the fact of building and it's consequences to urban atmosphere. Beyond, more than helping to identify the totalitarian architecture, these comparisons lead up to understand the intellectual exercise done by dictators. Indeed, it brings us to understand their way of imagining and materializing their vision of the world. Architecture is the key dimension of understanding totalitarianism.