[EDITED based on some of the responses]
Not really scams (thought sometimes you might feel scammed afterwards) but what are the real tourist traps in Europe?
I'm thinking of the places, events, and activities that the locals know aren't worth it but the tourists spend their money to do it anyway, or travel a ways to get there. And sometimes we don't mind spending our time and money on these things, but have to admit, it probably wasn't up to the hype or worth what we spent.
For example: kissing the Blarney Stone.