Berlin, Germany's capital and largest city, boasts 3.7 million inhabitants, making it the most populous city within the European Union. First documented in the 13th century, it served as the capital for powerful entities like Prussia and the German Empire before being famously divided by the Berlin Wall after World War II, only to reunify in 1990. Today, Berlin thrives as a global hub for culture, politics, and science, recognized for its innovative economy, prestigious universities, and iconic landmarks such as the Brandenburg Gate and several World Heritage Sites.