World capitals are cities where the government of a country is located. They often serve as the political, cultural, and economic centers of their respective nations. For example, Washington, D.C. is the capital of the United States, while Tokyo serves as the capital of Japan. Each capital has its own unique history and significance, often reflecting the country's heritage. Capitals can vary greatly in size and population. Some, like Beijing, are sprawling metropolises, while others, like Vaduz, are much smaller. Capitals are also important for international relations, hosting embassies and diplomatic missions from around the world.