At the beginnings of the 1900s, Otto Wagner’s architectural school may be considered like one of the highest expressions of the International rationalism, as it is testified by the interest shown by many American masters of Early Modern, like Louis Sullivan and Frank Lloyd Wright, in Wagner’s work. The Viennese School of Architecture can be considered the most important attempt made by the Austrian bourgeoisie to transform the Hapsburg Capital, Vienna, at that time seen as a City seriously on delay, if compared to the other European Modern towns, into a technologically advanced Metropolis, having its own subway lines, fast-traffic boulevards, low cost housing, and, of course, the luxury ornaments suitable to the middle class. The facade...