This intrepid INTA traveller has been having fun on Berlin's transport system to which your badge provides free access. Matching up the station locations with the map of lines had me beat for a time but the U2 line is a winner and will get you to Potsdamer Platz on Monday evening. No 1 is not the glitzy glass building but the old brick building covered in scaffold at ground level. See picture on right. The Olswang office is on the 14th floor but the top floor offers a most impressive panorama if you happen to find it during daylight. See picture below looking north - the blank space on the right is the Berlin Holocaust Memorial - not for the feint - hearted it will drain the joy from your soul.