01C Old Cairo was founded by the Arabs in 642 AD. Today the city of Cairo is the largest in Africa and the 16th biggest metropol in the world, with a population of more than 18 million. The city is expanding faster than ever. The historical Old Cairo is suffering hard from the fast growth of the city. This part of the city was originally not built for so many people. One of the main causes of the destruction of the area is the pollution caused by traffic. At the same time the number of lung diseases and cancer is increasing dramatically. Half a million people are suffering from diseases linked to pollution. Unesco launched a plan in the 1980's to preserve the old city. Most of the money was invested in tourist attractions and the local population was ignored. Old historic living areas are seriously endangered. It has come to a point where the old grave tombs have become shelters for homeless people.