The "D" tier represents the absolute bedrock of our rankings, the entries that, while perhaps holding a special place in some hearts, fall short when stacked against the competition. Here, we find Milan, a city often celebrated for its fashion and financial prowess, but in this particular context, it struggles to keep pace. Think of this tier as the "honorable mentions" that just couldn't quite make the cut. It's where you'll find the contenders that, despite their unique qualities, are ultimately outshined by stronger, more impactful options.