As their Wikipedia page puts it "Noisebridge is an award-winning anarchistic educational hackerspace in San Francisco", which in translation means 483.0958 square meters of total nerdy awesomeness. Its specific anarchistic touch is in perfect fusion with arts and cool people from all walks of life. If you are in SF for few days or even better - are moving there, you might want to check it out. Noisebridge is a very welcoming place, open for anyone interested to make stuff and learn new things... from speaking mandarin and enjoying philosophy chats to woodwork and state of the art computer security.
1500 m2 of creativity, wonderfully preserved 20th century machinery and newly DIY laser machines. What inspired me the most is the way Electrolab founders and core team built their community - each member can come with suggestions for a workshop area or project and then go make it real. They come and work on weekend and actively mobilize to pick up cool tech that Parisian companies recycle.