The most populous city in the United Kingdom is London. It serves not only as the capital city but also as a major cultural, political, and economic center. London boasts a diverse population with various ethnicities and cultures, contributing to its vibrant atmosphere. Iconic landmarks such as the Big Ben, Tower of London, and Buckingham Palace enhance its attractiveness to tourists. The city's extensive public transportation system, diverse job opportunities, and rich history make it a global city of significance.