In the 1800s London's East End was a destination for tourists wanting to visit a slum. More recently poor neighbourhoods in India, South Africa and Brazil have found themselves on the tourist trail.
Christa Larwood discovers that many developed Western countries are now also becoming slum tourism destinations and asks whether such tourism is ethical.
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Watch Fast Track on the BBC World News channel on Saturdays at 04:30, 13:30 and 19:30 GMT or Sundays at 06:30 GMT.