I would look at huge government agencies like State Transportation departments or environmental protection divisions or planning divisions – state agencies often have budgets that can absorb interns, have lots of really intense work, and would love to have some cheap labor for a few months – we hire interns where I work, a huge state transportation agency, and they are put to work drafting in microstation or AutoCad, photoshop help, counting irrigation heads or calculating pressure – you will see how the sausages really get made, and be part of it.
Warning to you – it is not easy work.!