Hi Stéphanie,
I spent two weeks in Berlin in December. For part of the trip, I was alone, and then there were four of us adults.
In December, it was cold, gray, and damp. By 4:15 PM, it was pitch dark. In February, the days might be a little longer.
The city is quite spread out, and you can lose a lot of time traveling from one point to another. I recommend buying the *Cartoville Berlin*—a very practical little guide with a detailed map and points of interest neighborhood by neighborhood.
I don’t know what your interests are or those of your son, so it’s hard to give specific advice.
Still, I think you should visit some key sites of European history (your son is in middle school, and I believe World War II is part of the curriculum): the East Side Gallery, Checkpoint Charlie, the Holocaust Memorial, which isn’t far from the Brandenburg Gate. There’s also a Spy Museum and a GDR Museum—I didn’t visit them, but I read they’re fun and interactive.
At the Museum of Communication, there are robots that interact with visitors.
I also saw that there are tours of Berlin’s underground (tunnels, bunkers, etc.).
Otherwise, the Berlin Zoo is one of the largest in Europe, and the Natural History Museum is well-known, though I didn’t visit it.
A weekend is short, so you’ll have to make choices—museums take time.
A nice walk is from Alexanderplatz to the Brandenburg Gate and the Reichstag, which isn’t far (you can go up to the dome, though we didn’t because of bad weather, so the view wasn’t great. Anyway, you’ll need to book in advance).
Gendarmenmarkt is also a lovely square to see.
Here’s the link to what I wrote live, with a summary of some practical tips:
https://voyageforum.com/forum/impressions-berlinoises-en-direct-d10801592-1/
" Celui qui voyage sans rencontrer l'autre ne voyage pas , il se déplace "
( Alexandra David-Néel )
" Ahora todos quieren ser latinos , no , ey , pero les falta sazon , bateria y reggaeton " ( Bad Bunny )