Berlin is the capital city of Germany...
and one of the 16 states (Länder) of the Federal Republic of Germany. Berlin is the largest city in Germany and has a population of 4.5 million within its metropolitan area and 3.5 million from over 190 countries within the city limits.
Berlin is best known for its historical associations as the German capital, internationalism and tolerance, lively nightlife, its many cafés, clubs, bars, street art, and numerous museums, palaces, and other sites of historic interest. Berlin's architecture is quite varied. Although badly damaged in the final years of World War II and broken apart during the Cold War, Berlin has reconstructed itself greatly, especially with the reunification push after the fall of the Berlin Wall in 1989.
Berlin is a huge city. You can make use of the excellent bus, tram, train and underground services to get around. Taxi services are also easy to use and a bit less expensive than in many other big Central European cities. You can hail a cab (the yellow light on the top shows the cab is available), or find a taxi rank (Taxistand). Taxi drivers are in general able to speak English. If you ask for a short trip (Kurzstrecke), as long as it's under 2km and before the taxi driver starts the meter running, the trip normally is cheaper, €4. This only applies if you flag the taxi down on the street, not if you get in at a taxi rank. Also, some online services like Talixo facilitate online and in-app booking.
Check the Berlin route planner (in English) to get excellent maps and schedules for the U-Bahn, buses, S-Bahn and trams, or to print your personal journey planner. The route planer can also calculate the fastest door-to-door connection for you destination for any given day and hour. The Berliner Verkehrsbetriebe (BVG) have a detailed fare list on their web site.
If you don't know how to get somewhere, or how to get home at night, call +49 30 19449, the Customer Service of the BVG. There are also facilities in most U-Bahn and some S-Bahn stations to contact the Customer Service directly. In 2005 the BVG introduced Metro lines (buses and tram) that run 24 hours a day, seven days a week. All lines are marked with a big orange plate and a white M.
It's also worth noting that the house numbers do not necessarily run in one direction (up or down). On a lot of streets, the numbers ascend on one side and descend on the other. Especially on long streets, check the numbering scheme first: you can find the name of the street and the numbers on that block at nearly every street corner.
Different from what is usual in some English-speaking countries, in Germany, you would have to add the word for "street", "square", "park", etc. when you mention the name of a locality. The simple reason for this is that the annex defines the locality and is part of its denomination. Thus, they would not simply refer to "Kurfürsten" when talking about Kurfürstenstraße (Kurfürsten Street), as this could also mean "Kurfürstendamm", which is a different road at a different place. "Schloss", which simply means "palace", could refer to any of the palaces in Berlin, as well as to one of the two roads called "Schloßstraße", a shopping centre called "Das Schloss", or the "Schloßplatz" in the Mitte district.