If only there were one of these in our fair city! San Francisco's Techshop is "a fully-equipped open-access workshop and creative environment that lets you drop in any time and work on your own projects at your own pace." Essentially a better version of the ID shop you had in school, Techshop stocks milling machines, metal lathes, plastic printers and RP machines, CNC laser cutters, MIG- and TIG-welding equipment, and more.
If you're a manufacturing processes newbie, they even offer classes for $30 to $60 on how to use various pieces of equipment. Anyone can walk in and work metal, plastic, fabric, leather, etc. For the equipment list, click here. For the complete course list, click here.