Save money buy Europe City Passes

Many tourism bureaus--including ones in Lisbon, Zürich, Budapest, and Stockholm--sell city cards that cover the costs of mass transit and admission to museums and also provide discounts to other attractions. To determine if they're worth it, however, you have to do the math: Sometimes you'll have to go to four or five museums just to break even. For a full list of cities with the cards, go to europeancitycards.com.