Tom Gilks / Basic electric wiring linking homes in a slum with a diesel powered generator, Remba Island, Lake Victoria, Kenya.

John Cancalosi / Kibera, one of Africa's largest slums, near Nairobi, Kenya, July 2017.

Tony Phelps / Bongolethu, an unnofficial settlement. Little Karoo, Western Cape, South Africa, August 2011

Tim Laman / Aerial view of rooftops of basic housing and railway, San Jose, Cartago, Costa Rica.

Fabio Liverani / Vegetable refuse from market stalls in the Bidonville slums of Lagos, Nigeria West Africa. 2002

Fabio Liverani / Beggars on railway bridge in the Bidonville slums of Lagos, Nigeria, West Africa 2002

Fabio Liverani / Street scene in the Bidonville slums of Lagos, Nigeria, West Africa 2002

Klaus Nigge / Aerial view of shanty town beside beach, Davao, Mindanao, Philippines, Celebes Sea, March 2007.