Editor’s note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter . Get news about destinations, plus the latest in aviation, food and drink, and where to stay. CNN  —  Today, it might be dismissed as just another port, but from day one this particular city has been a gateway to the world. At one point in time, it was the gateway to the world. A portal through which people passed on their way to some of the most resonant events in history. From the founding of modern America to