This article is from the Europe FAQ, by Yves Bellefeuille email@example.com with help from Martin Rich M.G.Rich@city.ac.uk.
Except for Turkey, always use the currency of the country you're
visiting. Even if US dollars or another currency is accepted, you'll get
a terrible exchange rate.
In Turkey, US dollars are very widely accepted, especially for large
purchases. Also, you'll get a much better rate of exchange if you obtain
Turkish liras (whether by changing money or from a cash machine) in
Turkey itself rather than in another country.
As of 1 January 2002, a new currency, the euro, is used in the following
countries: Austria, Belgium, Finland, France, Germany, Greece, Ireland,
Italy, Luxembourg, The Netherlands, Portugal, and Spain. For more
information, see the Euro Currency Changeover FAQ by Arwel Parry,