Wannsee is a worth while half-day trip from Berlin, and it is very easily accessible by S-Bahn line no. 7. You can get on this train in many stations in Tiergarten, Hauptbahnhof and Mitte, and the trip is considered within "zone B", so that if you have a day-pass or a 7-day-pass for zones A&B this covers the journey to Wannsee.
On the way I would recommend dedicating 15 minutes of your time to get off the train in the Grunewald station, go to Platform 17 ("Gleis 17") and visit the monument to the Jews transported to concentration camps and death camps from that very platform during the Nazi period. Then you can board the next S7-train to continue to Wannsee.
Written Oct 2, 2008
To reach Wannsee take the North/South train line on Berlin's excellent public transport system. From the Wannsee station it is a short walk to the bus stop. A circular bus route runs around the area and drops off outside the Villa - the stop is 'Haus De Wannsee Konference.' The same bus will take you back to the train station, where you can catch the same train back to Berlin centre.
Written Sep 11, 2006
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Reviews and photos of Großer Wannsee attractions posted by real travelers and locals. The best tips for Großer Wannsee sightseeing.

To reach Wannsee take the North/South train line on Berlin's excellent public transport system. From the Wannsee station it is a short walk to the bus stop. A...
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On 20th January 1942, Reinhard Heydrich, Adolf Eichmann and 13 other officers of the Third Reich's secret service and SS met in this house and agreed on what they called the final solution of the...
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House Of The Wannsee Conference

The Wannsee villa was host to what has become known as the Wannsee Conference. Chaired by Reinhard Heydrich, the conference outlined Nazi plans for the 'Final Solution' of the Jewish question with...
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grosser wannsee is a beautiful lake and a suburb of berlin. for students of 20th century history it is best known for the haus der wannsee. this beautiful lakeside villa was built in 1914 for ernst......
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