There are many parts of the world where tours of the poorer areas are available - but is it the practice ethical?
For many years guided tours have been available of the favelas or shanty towns in Rio de Janeiro, in Brazil.
A charity in the Indian capital, Delhi has been training some street children to become tour guides of the city.
But do these kind of tours offer travellers a cross cultural experience - or is it just voyeurism?
Lyse Doucet speaks to Tricia Barnett, the Director of Tourism Concern and Marcelo Armstrong from Favelas Tours.