American cardholders have found that their cards won't work at unattended kiosks. For example, the automated ticketing machines at train stations and the Vélib bike rental racks. The reason is the equipment is designed to only work with chip cards and you don't have an option. More often than not, the kiosks won't even take cash because a goal is to eliminate cash and coin management and vandalism. So that can affect metro and train tickets, highway toll booths, gas pumps, parking garages and other places where there are no cashiers.
As more countries around the world move to chip-and-PIN cards, it's inevitable that Americans will encounter more difficulties paying for things abroad