You might be on a business trip or an official meeting in Berlin, but you want to have a look around and you are short on time. Berlin is one of the exciting hubs of Europe. Berlin is the capital of Germany, since a long time, during the kingdom of Prussia, the German empire, the Weimar republic, the Third Reich and till present. In short from 1701 onwards it has been the capital. In this case you don't want to miss the best tourist attractions of this amazing city, here are the few places that you must see in Berlin. 
Brandenburg gate:
It's one most recognized places of Germany. Number of embassies are also located here, Hotel Adlon, a very old and famous hotel, is situated near to it. It's the places where most of the events like new year celebrations, concerts, etc are held through out the year. It's the first spot very your tour should start from. 
Holocaust Memorial:
This was made to remember the holocaust, and share the sympathies with Jews all over the world. It was inaugurated in 2005 and the construction cost is 25 million Euros. 
Location: Cora-Berliner strasse 

To take a GPS audio walking tour of major landmarks including the memorial, download and sign up for VoiceMap on your Android device or iPhone, select Berlin, and purchase the walk named Into the Heart of Berlin ($2.99).

Checkpoint Charlie:
From 1949 to 1990, present day Germany was divided into the east Germany and west Germany, this was the checkpost in the "Berlin Wall", which divided the country. This was also named "checkpoint c" by the allied forces at that time. Near to it you will also find leftover of the Berlin wall.
Location: Friedrichstrasse
Museum Island:
It's a complex of five museums Altes Museum, Neues Museum, Alte Nationalgalerie, Bode Museum, Pergamon Museum. It's also included in the UNESCO's list of World site Heritage. These museums covers many works from classicism in architecture to Islamic arts.
Location: Bodesstrasse

To take a GPS audio walking tour of Museum Island, download and sign up for VoiceMap on your Android device or iPhone, select Berlin, and purchase the walk named A Walk Through Time on Museum Island ($2.99).

Potsdamer Platz:
This place is designed by Renzo Piano, one of the famous architect around the world. It also famous shopping hub and offers difference of varieties from electronics equipment to boutiques. Its one of most exciting places in Germany.
There are be many other places which you can explore if you have time, but these places mentioned above shouldn't be missed.