Another Best DVD Extras suggestion:

Image Entertainment's "Ultimate Edition" of THE HUNCHBACK OF NOTRE DAME (1923 Chaney version) includes two sets of 3D glasses and a portfolio of twenty 3D still photos taken during production and pre-production! I had no idea that such materials existed, but the quality is astounding. The disc also includes a Michael Blake commentary, a complete reproduction of the twenty-page theatrical program booklet, about a minute and a half of footage of Chaney out of makeup visiting the HUNCHBACK set, and a 13 minute segment (evidently all that survives) of the 1913 Universal film ALAS AND ALACK, which also features Chaney as a macabre-looking hunchback.