I work for Habitat for Humanity. I help run a store called "The Habitat Restore" where we take in donations of building/house goods and recycle them and sell them to the public at a reduced price and all proceeds go to the Habitat For Humanity charity.
Unfortunately I was so busy at the store I was unable to participate in the home building last year and hoping that I will be able to participate in the 8 homes we are building in this area this August.
But it's an amazing experience. A lot of the families come into the store and volunteer their time and I have met so many awesome people that have been helped by this Charity. When the houses are complete you can stand there and see that you helped to create something that is so important to the people you are helping.
http://www.habitat.org// Get some more information at the website. Hope this helps.