People watch the streets from their balconies from a high rise apartment in Nairobi's sprawling Mathare slum. October 26, 2017. Mathare is one of Nairobi's oldest slums, the first residents started arriving here in the 1920s. Now there are around 200,000 in Mathare’s 13 villages (according to a 2012 study) living in shacks densely built along winding and narrow unpaved alleys with little open space. Roads are used for drainage and trash, its now the rainy season and the pathways have become thick with mud and waste. Crime is a real and constant threat, especially after dark, making women and girls particularly vulnerable. ©Georgina Goodwin/AFP Photo/Getty Images