My favorite cappuccino was, naturally, in Rome. It wasn't the $18 cappuccino I had in Venice, though the environment was pulling REALLY hard for it to take the top position. Everything just came together at the Daphne Inn in Rome. And with a cappuccino like this, you know it's going to be good.
It's a fairly simple thing... coffee, water, milk, maybe a dash of cocoa. But bring it all together properly and it can create an incredibly memorable experience.