A painting of Durand Union Station and Michigan Railroad History Museum that was included in a hardware store's calendar that found its way to the set of 'The Big Bang Theory' ended up in a scene with Sheldon and Amy.  The recent episode has the pair talking in the kitchen while in the background, hanging on the refrigerator, is the calendar and it's turned to the page featuring the depot.  (We're not exactly sure what month it is.)

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