Hacker Dojo is a "hackerspace". Hackerspaces exist all over the world: http://hackerspaces.org/

There is even a hackerspace in Pittsburgh: http://hackerspaces.org/wiki/HackPittsburgh

In theory, hackerspaces are great places where "people can meet and work on their projects." In practice, however, hackerspaces - like any start-up - have the DNA of the co-founders and original visitors. As such, some hackerspaces are better managed than others. Likewise, some hackerspaces are a better "fit" for one type of hacking or another (start-up hacking, hardware hacking, artistic hacking, etc.)

Hacker Dojo just happens to be extremely well-run, well-funded, and perfectly located in the heart of Silicon Valley.