I've seen it in Nordic countries (Sweden, Latvia). It's a tree that reaches maybe 5 or more meters high and its flowers have a beautiful scent.
It's the common Prunus padus, which flowers with its strong scent now in many parts of Sweden (including my yard). At least if you are referring to the common species found in the wild (there are planted domesticated varieties as well). It is common across many parts of Europe though, and not only the Nordic countries, and can be found in Asia as well.