Le Havre, FRANCE

During World War II, the Allies bombed Le Havre so they could take back control of the city from the Nazis. 90% of the centre was destroyed. After the war, Auguste Perret was chosen to rebuild it. He and a team of 100 architects built 10,000 apartments using reinforced concrete. In 2005, UNESCO gave Le Havre a World Heritage listing. It is the only city in the world to get this recognition for its public housing.