Typically, people expect to find pinball machines in areas that have video games, like arcades. However, back in the early 90s when TAF introduced the resurgence of pinball, pinball was literally everywhere. Then P2K arrived and they practically disappeared.
Some locations still seem to exist... Recently, I discovered a WCS94 at, out of all places, a Prime Honda dealership in West Roxbury. No video games. Just that machine sitting out in the open. It was turned off, but it was an interesting experience nevertheless.
Have you found any machines in places they wouldn't be?