That was the plot of one of the Professor Layton games—the characters thought that they were brought into the future, but really it was an underground facility

That was the plot of one of the Professor Layton games—the characters thought that they were brought into the future, but really it was an underground facility designed to fool people into thinking it was the future. Professor Layton games have this thing where, the explanation seems to be supernatural (or involve far future technologies), but then you discover the truth, and it's always, always something completely unbelievable and incredibly unsatisfying.