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Photo: Angela M. Arnold, Berlin (=44penguins), CC BY-SA 3.0 via Wikimedia Commons
The cemetery is also known as the Memorial to the Socialists. It has many interesting monuments and graves of known people.
Friedrichsfelde Central Cemetery is a cemetery in the borough of Lichtenberg in Berlin. It was the cemetery used for many of Berlin's Socialists, Communists, and anti-fascist fighters.
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This museum describes the procedures applied by the East German secret police. Every Friday to Monday, there is a guided tour in English at 15:00 (5€).
The zoo in the former East Berlin is more spacious than its West Berlin counterpart, the historic Berlin Zoo and has been open for some 50 years. The Tierpark has nearly as many animals, but fewer reptiles and aquatic animals. It appears rather like a park with animals than a classic zoo, in fact it is one of the biggest zoos in Europe. There is an old castle from the late 17th century in the northeast of the Tierpark (Schloss Friedrichsfelde).
A relatively well and completely retained (at least by Berlin standards) 19th century residential quarter. Partly under renovation. Of note are six buildings first (1875) built of concrete - but you can't make out a difference from the outside.
Stasi Prison
Experience the Stasi Secret Police Prison first-hand. Tours are compulsory. Some of the tours are done by former inmates.
A small castle in late classical style. It was built 1868 by Martin Gropius (uncle of the Bauhaus-founder and other architects, the von Siemens family changed the castle a bit around 1900 and they enlarged the dimensions of the park, which is today renovated and nice to wander around when the sun is shining. Located within a few minutes' walking distance from Biesdorf station (take the S5 from the city centre) or Elsterwerdaer Platz station (U5).
German-Russian Museum
In this house the surrender of Germany was signed on May 9th, 1945, ending WWII in Europe. This museum describes the history of the war between Germany and the Soviet Union between 1941 and 1945 and the GDR/German-Russian relationship ever since. Historic rooms, permanent exhibition and special exhibits.