National Institute of Standards and Technology (NIST)'s division of building and fire safety performed the scientific investigation of the World Trade Center (WTC) disaster. Much of the related video, audio and photographic evidence was released under FOIA. Just in time for the 10th anniversary of the disaster the FOIA'd data was released on their website:
Since FOIA requires the raw, unaltered, data to be released, many of these videos are at very high resolution. (Lower res versions are available for easier viewing, of course).
If you go to the website, you can watch all the material.
If you go to Usenix LISA 2011, you can see a presentation by the sysadmins that built the site, and learn the technical and non-technical challenges that threatened the project along the way.
This year's Usenix LISA is in Boston from December 4-9, 2011. See you there!