Prelinger Archives is an Internet Archive, of "Internet sites and other cultural artifacts in digital form," providing "free access to researchers, historians, scholars, and the general public." The Prelinger Archives were founded in New York City in 1983 and eventually was taken over by the Library of Congress in 2002. The site has thousands of movies, audio recordings, texts which include promotional, industrial, and instructional films, wartime propaganda reels, advertisements, and home movies. All are in the public domain and offer rich historical content. The site even has a 9-11 archive of news pieces and news coverage.
In the audio recordings section contains audio from live concerts, audiobooks, and radio programs. In fact, if you are a Grateful Dead fan, you may want to check this site out.
The text section contains thousands of free books and ebooks, which can be printed for your enjoyment.
This site literally connects you with thousands of historical documents, videos, and recordings. Sometimes YouTube and Google are limited on what you can find. Why not try this site out? What a great way to enhance instruction in your classroom!