Earthwatch is a nonprofit thats been around since 1971, their mission is to unite;
“people worldwide in scientific field research and education to promote the understanding and action necessary for a sustainable environment.”
They work with archeologists, conservationists, ecologists, and of course anthropologists. They have offices in 50 different countries and are always working with the locals to advance research for the sake of our little blue planet. Earthwatch is always offering jobs and internships which you can browse through in this link.