They have games you probably never saw in arcades, too, because they didn't see wide distribution. For example, a previous boss of mine used to work for Midway back in the day, and he donated some of the arcade games he worked on to Galloping Ghost. Galloping Ghost helped him restore one of his rarest ones, too, and it's playable there.

More on topic, if you're in the area to check out Galloping Ghost, you can head a little ways Northwest to Schaumburg and go to the 257 restaurant, which is basically a Namco museum and has food, bowling, and a bunch of Namco arcade games and memorabilia.