From my observations in Europe, one can usually tell from the bars. If the bars are flat, they're mainland European, if the bars are dropped, they are N. American or British.
However, gravel bikes have created a tangent. I suppose we'll have to wait a few years to sort that one out.
A large target area for viewing tourers is the Alpe Adria bike route from Salzburg, Austria to Grado, Italy. Maybe the most populated touring bike route in Europe. There are numerous videos, which can give one a general idea of the bar situation