The following link is to the single largest WTC research photo archive on the internet

WTC Demolition Research Photo Archive


The following link lists all other major 9-11 photo archives on the internet.

List of 9-11 photo archives

If I missed a good archive on the list, please let me know. Thanks

A torrent file is also available with many pre-911 pictures, interior and exterior, including the mechanical floors. Descriptions are lacking, but they appear to have been taken by some sort of building inspector ( just my guess ).

http://thepiratebay.org/tor/3780672/World_...ictures-pre_911

Edit to add : if anyone has any other interior shots pre - 911, please share them in this thread.