In the tourist areas of Istanbul, such as Sultanahmet, Taksim and the Grand Bazaar, there are numerous exchange offices. Look for stores with signs that say "döviz" or "exchange." Also, many banks offer currency exchange services, and airports usually have exchange bureaus open around the clock. When exchanging currency, pay attention to exchange rates and fees, as they vary widely. It is important to check the rate quoted by the exchange office or bank before exchanging.