Here is a couple of drawings made during the short trip to Berlin and finalized later at home.
There is a great way to visit many intresting places in Berlin in a short time. You can buy a "whole day" ticket for special tourists buses, which travel around the city and stop at the most famous places like Checkpoint Charlie, Sony Center, Alexanderplatz, Jewish Museum, Brandenburger Tor and more... around 15 stops. So, you can stop and take time visiting the places you like. The new bus comes every 15 minutes and it's very convenient.
Berliner Dom with its surroundings is especially beautiful place with a possibility to take a one hour boat trip.
Another impressive place is, of course, Brandenburger Tor. There are funny entertaining activities around it, like costumed characters, a maker of big soap bubbles (50 cm in diameter), street dancers and others.