US Driver s License as ID in Europe?

I will be traveling to Europe next summer with my friends, all of us will be 18, and was wondering about using our US driver s license as IDs for getting into bars and such. I feel like it would be better to leave our passports locked up at our hotel rather than carry it around. So would my drivers license and a... show more I will be traveling to Europe next summer with my friends, all of us will be 18, and was wondering about using our US driver s license as IDs for getting into bars and such. I feel like it would be better to leave our passports locked up at our hotel rather than carry it around. So would my drivers license and a photocopy of my passport be sufficient for non-governmental identification?
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