They say you can’t put a price on nostalgia, but apparently, you can if it comes in the form of cardboard and nostalgia-scented wood. Vintage puzzles, once the quiet pastime of rainy days and long holidays, have turned into serious collector’s items. Whether it's because of their rarity, cultural significance, or just good old-fashioned puzzle craftsmanship, these jigsaw treasures now fetch hundreds—sometimes thousands—of dollars at auctions and collector sites.