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The invisible ghosts inhabit the town of Dry Wells in the American west.
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The Richie Rich/Scooby-Doo Show
Shaggy Rogers, Scooby-Doo, and Scrappy-Doo were stranded in the town when their train left them behind. They checked into a hotel where every room but one was filled with the ghosts. The ghosts ate dinner with them (Scooby was blamed by Shaggy and Scrappy for eating the food on all the other plates). Later the ghosts started playing pranks like painting Scooby and Shaggy with glue. The three tried to get away on a train but found it had an invisible ghost conductor, so they took off running down the tracks. (Scooby Ghosts West)