Old-style candy shops have become rare, but these days many adults visit them out of nostalgia.
駄菓子 (cheap sweets) + 屋 (shop). For many Japanese the 駄菓子屋 is a symbol of the Showa-era childhood: after school, children gathered there with a coin or two, chose sweets, and played. Few remain today, but the word carries strong nostalgia.
Common collocations
駄菓子屋のおばあちゃん: the old woman who runs the candy shop