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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.
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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€).
Friedrichsfelde Central Cemetery
The cemetery is also known as the Memorial to the Socialists. It has many interesting monuments and graves of known people.
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).
Stasi Prison
Experience the Stasi Secret Police Prison first-hand. Tours are compulsory. Some of the tours are done by former inmates.
The second largest Jewish cemetery in Europe.
There is a harness racing track in Karlshorst.