Texts for university lectures pertaining to the architecture of the first decades of the 20th century, elaborating on the main trends of the time (Art Nouveau, Vienna School, Deutscher Werkbund); examining the impact of new materials and new trends in painting on architecture. Architecture of the mid-war era (Modern Movement, Bauhaus) and the modern architecture of revolutionaries and dictators (Russia, nazi Germany, fascist Italy) are central to the analysis. Architecture in Greece during the dawn of the 20th century is the topic of the second part