Using plastic money for purchases in Europe frequently prompts questions about fees -- exchange fees, account service fees. The New York Times subsidiary Wirecutter has assembled a guide to what American credit card companies charge. It includes regular fees and minimum account limits as well as what's charged for purchases in Europe. It also points out that some domestic brands are less widely recognized abroad; MasterCard and Visa seem to be accepted everywhere.
https://thewirecutter.com/money/credit-cards/no-foreign-transaction-fee-credit-card/