ATM machines can be found in
almost every corner of the world. They dispense cash in the currency
of the country you are in. Check with your bank, credit union, or
credit card company to see the maximum amount of cash you can withdraw each
day. Typically, it is the equivalent of $US 300 dollars a day. There
will usually be an ATM fee for withdrawals. An ATM system will usually
accept various types of cards. Check with your financial institution to see
what ATM system your card is accepted at or look on your card and on the ATM
machine itself for various logos of the different systems.
The Independent Traveler website has an excellent article about using ATM machines worldwide. So does Fodor's in their story The Ins and Outs of ATMs and Are Traveler's Checks Obsolute?
To find an ATM machine at an airport, do a web search with the name of the airport + airport ATM locations.
Example: Heathrow airport ATM locations