Even if you see nothing else, walk along the East Side Gallery, a section of the Berlin Wall grafitied by a group of international artists. It's a shame that people feel a need to write messages on it, but it's still worth seeing.

the DDR museum is really fun, it`s like being thrown back in time.

I highly recommend buying the city tour bus pass, it allows you access to most of the city and runs all day long. Find a site that sounds interesting and get off to look around (head-set provides descriptions as the bus approaches each site). Also, get used to using the subway, it's invaluable for getting around. I'm sure everyone says this, but I'll re-iterate that Checkpoint Charlie is a must-see. The museum is such a powerful reminder of the atrocities that took place on the other side of the wall and I was absolutely amazed by all the ways people escaped.

If you are a fan of museums the Berlin Museum Island is well worth checking out. All 4 museums have excellent collection of art. http://en.wikipedia.org/wiki/Museum_Island

Get a piece of the wall

I'm acctually going to Berlin in May so we'll see if I remember anything at all from my last visit (when I was 13!). Anyways, me and my boyfriend, we're gonna go sightseeing, a little museum hopping, taking cute pictures of us kissing everywhere etc etc! Can't wait, I'm sure it's gonna be sunny and warm and a great trip.

The Reichshaus, the Brandenburger Tor, the Wall all cool things.

When in Berlin, go to oranienburgerstrasse (East berlin)and have a look at Tacheless. You will find a lot of art, a café, a bar/lounge and a small cinema here. Very cool place! If you are young and like electronic/indie/balkan/reggae music and underground places you must find your way to Rosis, which is a very cool, dark, underground, cozy place. Revaler str.29. East Berlin

Principalmente pra quem for ficar poucos dias... FREE TOUR!!! Guias super competentes e divertidos contam muitas das milhares historias de Berlim! Saida em frente ao Starbucks da Brandenburger Tor

Nice place :-) Lots of history. Some kind different from other capitals, that makes the city more special.