Foreign Currency
Much of Europe uses the Euro, which is great - your cash can be used in multiple countries. However, there are many countries that use their own currency. Switzerland uses the Swiss Franc, Great Britain uses the Pound Sterling, Turkey uses the Turkish Lira, and Egypt uses the Egyptian Pound. There are always foreign currency exchanges at the airports, and most banks will exchange money for you. I always rely on ATMs. They're everywhere and you can avoid costly exchange fees. My banks don't charge a fee for the exchange or the ATMs - and I get reimbursed on the ATM vendor's fees. When using an ATM you should choose to decline the foreign exchange fees. It will still give you your money, but the fees, if any, will be calculated by your bank.