Unpacking the Capital: Why Is London So Densely Populated?: A Complete Guide London isn’t just the capital of the United Kingdom; it’s a vibrant global hub, a city that conjures up images of iconic landmarks, bustling financial districts, and a rich tapestry of cultures. As you wander through its streets, you can’t help but notice the incredible diversity of people—the constant hustle and bustle of the Underground, the lively markets, and the long lines outside West End theat