What i discovered today at the Melbourne Central: the Coop’s Shot Tower Museum (free entry via R.M. Williams store) and the Community Garden on level 2. Great place to hang out, especially if it is cold, wet or windy outside !
http://www.melbournecentral.com.au/
http://en.wikipedia.org/wiki/Coop’s_Shot_Tower
http://www.melbournecentral.com.au/Centre-Info/Community-Kitchen-Garden
HappyChirashi 
This is very interesting. A lot of good photos and various interesting themes.