It’s nice having some record of the places you’ve visited, but FourSquare is a little granular for my liking.
Traveler’s Badges keeps it simple and broad. You just let it detect your location, and it generates a unique badge for your current city that you can collect and add to your collection. It even logs the date and time you were there, in case anyone asks.
If you want to get all global with it, you can even display all of your badges on a map. It’s not the most practical app, but it is pretty cute (and free). And it’ll kill like five seconds of a layover. Every bit helps.