Capital cities are the administrative centers of countries, often housing the government and important institutions. They serve as the focal point for political activities and are typically where the head of state resides. Examples include Washington, D.C. in the United States and Tokyo in Japan. These cities are not only political hubs but also cultural and economic centers. They often feature significant landmarks, museums, and vibrant communities. For instance, London is known for its rich history and diverse population, making it a key player on the global stage.