In a few days, I'll be on a plane headed toward Mexico City. It's one of my favorite cities to visit, and a place I recommend everyone see at least once. It's everything you might've heard — enormous, vibrant, culturally modern and ancient, a place where the ruins of an uncovered Aztec temple squat in the middle of a busy subway station. It's truly a world-class city. It's also a place that, from the moment I first stepped off after a 24-hour bus ride, felt like home.