 Even though the bombing of Freiburg on 27 November 1944 destroyed about 38km of roads and pavements, many of the pavings survived and can still be admired today.The tradition of cobblestones enjoyed a revival during the 1970s when the old city of Freiburg was turned into a pedestrian zone.For instance, the pavements of Kaiser-Joseph-Straße, Freiburg's main shopping street, was paved with red porphyry and decorated with bands of white marble and smaller cobbles found in the Rhine.