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Edited

to be a philantropist, you usually pay your own passage. if not, that would not be volunteerism.
if it's to help mankind, and to go to a place where you can also use your camera for editorial usage,  there are lots of such NGO (i think that's what they used to call them) organization  that are based in these places, central am, south am,etc..
some even give you citizenship if you remain with them for 5 years.
if it's for other reasons, such as excavation sites for archaelogy, there are similar organizations are well.

it's been a long time , but i know that was so with favela-ridden Brazil where you volunteered to help build communities. lots of young ppl, mostly from europe, during my days of travelling constantly used to volunteer to become "missionaries" to help with building houses, digging wells, building roads, education,etc.. in the most remote areas of Brazil.

maybe madelaide would know if it's still prevalent, but i know , as i said, many many years ago, Brazil used to  highly values such services to , as i said, even offer you the choice to become Brazilian citizen after 5 years of volunteerism.
you pay your own passage naturally.

Vonkara, it seems you think that a refugee or displaced people camp is a kind of summer camp.  I guess you have never been close to any tragedy.   

Perseus, there are many volunteer work here, and I know at least one international agency who organizes volunteer travels, but I never heard of this citizenship thing.  Also many churches organize field trips in the developing countries, especially for teenagers, what I find very interesting for developing humanitarian values in a society that is growing ever so selfish.

Yea, doing isolated traffic light all year long must took away all emotions and empathy. I will keep shooting objects, they don't judge someone on a single sentence