The "History of Australian Theatre Archive" (HAT) is a non profit website that aims to encourage the study of Australian Theatre History. It has a large database of people associated with Australian theatre history, articles about theatre history, short biographies from the newspapers, autographs , historic pictures of theatres and performers and links to other websites. It also has information about Houdini's Tour of Australia and a section on Australian Magic History.

http://www.hat-archive.com/

The site includes many images of theatre buildings:
http://www.hat-archive.com/theatres.htm