K'naan and Sol travel to Kibera, the largest slum in East Africa, to connect with local hero Salim Mohamed.

Casey Affleck and Sol travel to the Pawnee Nation reservation in Oklahoma.

M.I.A. is in Liberia.

Mos Def in City of God, Rio.

Joaquin Phoenix goes to Yawanawa in the Brazilian rain forest.

Eva Mendes travels to Vancouver.

Flea travels to the hills of Haiti.

Cameron Diaz travels to the Andes mountains of Peru.