Medellín's slums are revitalized by repurposing water tanks into public parks.
While working on a master plan to update the streetlights of Medellín, Colombia, public works officials found something strange in a satellite image of their city: 144 “islands of darkness” forming a ring around the middle of the city.
To their surprise, according to an article in Platforma Arquitectura, they discovered that these dark spots were located at the sites of 144 water tanks that had built between 1910 and 1950, at what was once the edge of the city.