I have a $100 bill in my wallet. It has been there for years! Also Euro, which under normal circumstances gets spent regularly. Then some GBP. Anywhere on the planet will accept them and many other currencies. It's money, people want it. Days after the Euro launched, I saw them in use at Afghan money changers. In these times it is very rare to find somewhere that does not have Visa/MC ATM's. For me, it is more important to keep a spare credit card hidden away.