There is a massive room inside McDonald's world headquarters filled with toys, costumes and restaurant nostalgia that the public rarely gets to see.The company makes its headquarters in Chicagos West Loop neighborhood with more than 2,000 employees working out of the building.McDonald's world headquarters in ChicagoRob Carroll photoloading...The ground floor of McDonalds headquarters features a restaurant serving menu items from across the world, including many that arent available anywhere else in the U.S. Upstairs sits workspaces, test kitchens, and a training area dubbed Hamburger University.Look hard enough and you will find McDonalds official archives. The area, like the rest of the building besides the restaurant, unfortunately isnt open to the public.NOTE: 28 Exclusive Photos Of Amazing Retro McDonald's Items Follow BelowRob Carroll photoRob Carroll photoloading...I did, however, get an exclusive tour during a recent press event. Archivist Mike Bullington opened his doors and let us roam around shelf after shelf of McDonald's history.Bullington, the first ever trained archivist hired by McDonalds, told our group that he even has an incognito eBay account to purchase rare items online to add to the collection.Here is a look at some of the unique vintage McDonald's items that can be found in the fast food giant's official archives.28 Vintage McDonald's Items Hidden In Super Secret Archive at Corporate HeadquartersMcDonald's world headquarters in Chicago features a massive room devoted to archiving the fast food restaurant's history. From character costumes to vintage menu items, McDonald's archives is packed with history that will have you reminiscing about your childhood.Gallery Credit: Rob CarrollREAD MORE: Beloved 80s Foods That No Longer ExistGet our free mobile appOnce-Beloved Fast Food Items That No Longer ExistThese defunct fast food items have gone down in history. Wouldnt you love to eat them again?Filed Under: Fast Food, McDonald's, NostalgiaCategories: Longform