Walter Gropius's 1926 Bauhaus school building — the manifesto of European modernist pedagogy in built form. UNESCO 1996.
From Wikipedia
Bauhaus Dessau, also Bauhaus-Building Dessau, is a building-complex in Dessau-Roßlau. It is considered the pinnacle of pre-war modern design in Europe and originated out of the dissolution of the Weimar School and the move by local politicians to reconcile the city's industrial character with its cultural past.