I began my 2007 Germany trip with several days in Berlin. I used one of those days for a day trip down to Potsdam, home of Schloss Cecilienhof, site of the 1945 Potsdam Conference, and home of Schloss Sanssouci.

Mark Wasson, http://www.markwasson.com > Trips has detailed summaries of my trips

http://www.markwasson.com/u2007g07agermany.htm