Berlin is the capital city and one of the sixteen states of the Federal Republic of Germany. With a population of 3.4 million in its city limits, Berlin is the country's largest city. It is the second most populous city proper and the ninth most populous urban area in the European Union.Located in northeastern Germany, it is the center of the Berlin-Brandenburg metropolitan area, comprising 4.9 million people from over 180 nations. First documented in the 13th century, Berlin was successively the capital of the Kingdom of Prussia (1701-1918), the German Empire (1871-1918), the Weimar Republic (1919-1933) and the Third Reich (1933-1945).After World War II, the city was divided; East Berlin became the capital of East Germany while West Berlin became a Western enclave, surrounded by the Berlin Wall from 1961-1989.Following the reunification of Germany in 1990, the city regained its status as the capital of all Germany. Berlin is a major center in European politics, culture, media, and science.It serves as a continental hub for air and rail transport. The city's economy is primarily based on the service sector, encompassing a diverse range of creative industries, media corporations, environmental services, congress and convention venues.Berlin is the third most-visited tourist destination in the EU.Other industries include traffic engineering, optoelectronics, IT, vehicle manufacturing, health care, biomedical engineering, and biotechnology. The metropolis is home to world-renowned universities, research institutes, sporting events, orchestras, museums and personalities.Berlin's urban landscape and historical legacy has made it a popular setting for international film productions. Recognized for its festivals, contemporary architecture, nightlife and avant-garde arts,Berlin has evolved into a focal point for individuals attracted by liberal lifestyle, modern zeitgeist and low cost of living.