Berlin has over 200 museums - so even for a local it would be a daunting task to visit all of them. Good thing is some of the best museums are all conveniently located in one place - the Museum Island. Here you will find 5 museums - the Altes Museum, Pergammon Museum, Neues Museum, Bold Museum and Alte Nationalgalerie.
The Museum Island is surrounded by the River Spree.
With limited time - one has to be very selective in choosing which museum to visit. If you can only visit 2 or 3 - then my top list would be Pergammon Museum, Altes Museum and Neues Museum.
There are many entry points onto the Museum Island - but the most prominent would be through the Lustgarten - a large park fronting the Altes Museum. To the North of the Park is the Berliner Dom - the famous 19th Century Cathedral of Berlin.