Theoretically, you can use Visa Electron cards, both for purchases and at cash machines, throughout the world. See here:
http://international.visa.com/ps/products/electron/
Whether or not individual companies choose to accept them might, of course, be a different matter! (i.e. If a retailer swipes your card through his machine, then the transaction will go through OK. However, if the retailer thinks that he'll be charged too high a commission for the card transaction he might simply refuse to accept the card).
Chris