I will usually get about $100 dollars worth of the country's currency before I go, just in case something happens, and I need to get a taxi or something, and they don't take a credit card. But so many places take credit cards these days, cash is rarely needed (you can even use paypal to tip the Adventure Guides most times now, but you can always use whatever cash you have left over to pay for that). And ATMs are plentiful in Europe if you have an emergency.
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