Since the fall of the wall and the reopening of the borders with Eastern European countries, Berlin has become the gateway to Eastern Europe. As a consequence of German reunification that was made official on 3 October 1990, Berlin is once again the capital of united Germany. Berlin is the largest German city and one of the liveliest, most interesting and changing capitals in the world. There are 65,000 people working in this sector in the Greater Berlin area. In fact, Berlin's historical center, with the Brandenburg Gate and the Potsdam Place, will become Europe's most rapidly changing city center.
Berlin is a first-class cultural metropolis.
Also worthy of mention are the numerous theaters, commercial galleries and exhibitions. Seven other colleges are also located in Berlin. All three universities and a number of the colleges have computer science departments. Research in software engineering is also conducted at several other institutes. Teaching and research in the TUB computer science department focuses on software and communication technology.