BBC World Service has over 500 audio documentaries you can download. The subject matter is incredibly wide ranging, for example, internet cafés, the influence of Islamic art on William Morris, South African female AIDS activist Thembi Ngubane, Yiddish, the importance of cows, novelist Chinua Achebe, financial risk management, Obama as an intellectual, the physical and emotional effects of a car crash and many, many more. If the quantity and variety are overwhelming, you can subscribe to a podcast, which delivers a new documentary to you every single day.
Luna Commons is a database of sixteen free digital image collections built using Luna Imaging's Insight software. And there's a lot of cool stuff, well over a hundred thousand images all available for download in good resolution. Here are some of the collections featured: Pratt Institute Fashion Plate Collection, The Farber Gravestones Collection, Maps of Africa, Cornell Political Americana Collection and the The Estate Collection of art by HIV+ artists. The advanced search allows you to search across all collection, for example seeing everything across all collections about animals or New York or your birthyear. Whatever you look for, it's gonna bring up a boatload of interesting images.