Several years ago, not long after my wife and I first started dating, we took a trip to visit her family Philadelphia. It was a cold and rainy December, but I had never been to Philadelphia before so, despite the miserable weather, we tried to make the most of it. We hit all the obligatory tourist stops the city had to offer—Independence Hall, the Liberty Bell, the Italian Market, the cheesesteak stands, of course, the Philadelphia Museum of Art, the steps leading up to which were made famo...