Grassroots Exposure by Photographers Without Borders (PWB) showcases images from select photographers who have volunteered their time to capture the work of grassroots charities around the world. These photographers have travelled to Tanzania, Guatemala, Bangladesh, Peru, Colombia, Indonesia, and Bolivia, to show you some inspiring stories of community, collaboration and positive change. If you see one of PWB's images on the subway, take a picture and tweet @PhotographersWB for your chance to win a PWB Prizepack!