I always love looking at old Melbourne historical things.
The 1966 Melways has to rank as one of the coolest old Melbourne based resources you can find online.
It's fascinating looking at the map and seeing how much my local area (Bonbeach and Chelsea) has changed over the last almost 60 years. It's Map 97 for those interested.
You also can't go past this 1945 visual of Melbourne but in my opinion the Melways trumps this.