Every evening I go for a walk to Brandenburger
Tor and back to Alexanderplatz. 5 km and one hour for solitude. The way is very touristy, so surely there will be lost tourists with the question "where is..? "
On the left site from Gate you kann see Potsdamer Platz with beautiful Sony Center.
Another sightseeing of Berlin is Rote Rathaus
And one more is Marienkirche
Thank you for your attention! :)