Stockholm became a modern, technologically advanced, and ethnically diverse city in the latter half of the 20th century. Many historical buildings were torn down during the modernist era, including substantial parts of the historical district of Klara, and replaced with modern architecture. However, in many other parts of Stockholm (such as in Gamla stan, Södermalm, Östermalm, Kungsholmen and Vasastan), many "old" buildings, blocks and streets built before the modernism and functionalism movements took off in Sweden (around 1930–35) survived this era of demolition. Throughout the century, many industries shifted away from industrial activities into more high-tech and service industry areas.