At archive.org, the online home of The Prelinger Archives, you can watch hundreds of so-called ephemeral films: advertising, educational, industrial, and amateur movies that were never intended to have a long shelf life. Rick Prelinger, the founder of the archive, has spent much of the last three decades rescuing these amazing artifacts, many of which have significant historical value. Like the video below: It’s a promotional video for the World’s Fair in Seattle in 1962–the exact Mad Men moment. The film was sponsored by AT&T. Lots of amazing shots of “telephone switching centers,” the Space Needle, and other futuristic attractions.

Visit The PrelingerArchives for much more.