Prospecting in Europe - experience reports, people and more

I'm starting to get serious about panning for gold, but as a person born and living in Germany I am bound to be dissappointed over and over. I have tried a few rivers that are supposed to be gold bearing and have found nothing yet.
I tested my panning with iron washers as well as my sluice in rivers and all seemed fine with that so far, so while I am not experienced I don't think that is my major problem atm.

In summer I will visit the austrian alps, which is said to have great gold deposit (for europe) but I want to expand into more regions for holidays where I could pan as well.

France, Poland, Czech Republic, Switzerland..... or any place else?

Is anybody here from Europe that can share their experience or a location? I would also be open to join groups for prospecting!