S1, E1: Around the world, people are tackling issues of urban poverty with determination and ingenuity. The people of Kibera, one of the largest slums in Africa, are finally putting themselves on the map and improving the infrastructure in their community. In South Africa, an architect teams with an engineer to devise a better way to build with local materials. And in Medellin, Colombia, a visionary team reinvigorates the city with cable cars and spectacular architecture.