'PAZ' (peace) spelled out in plants in a public garden on the 'hill', in Moravia. The slum district was the city's main rubbish dump and a huge hill of rubbish, known as El Morro de Moravia, polluted the whole area. A massive reclaimation project resettled thousands and turned the hill into a public park. In recent years the city has been transformed using a model city authorities have named 'social urbanism'. This involved heavy investment in the city's poorer areas, education and business development and its urban transportation system. The murder rates have dropped ten fold and the city, although not without serious issues, has been acclaimed worldwide for its innovation and social progress. Despite all the improvements, Medellin's residents continue to be displaced from their homes by inner city drug gangs and a half century of war, the world's longest lasting current conflict.