AI in an ancient city: Can technology help you on your European vacation?

"When in Rome, do as the Romans do," the proverb says. But what if you're only in the Italian capital for just one day and you're keen to fit in as much of its history and culture as possible? Sure, you could take a few hours out to plan your trip or you could try to book a tour guide to take you round "The Eternal City." But now there's a third option: Tourism apps, websites and chatbots that use artificial intelligence to tailor itineraries for the user based on their preferences and time. They're rapidly popping up, so NBC News decided to put three of them to the test.