The Tränenpalast

The Tränenpalast (English: "Palace of Tears") is a former border crossing point between East and West Berlin, at Berlin Friedrichstraße station, which was in operation between 1962 and 1989. It is now a museum with exhibitions about Berlin during the Cold War period and about the process of German reunification.
In 2008 the Tränenpalast became a federal memorial site.[4] On 15 September 2011, the Haus der Geschichte opened the museum with exhibitions about Berlin during the Cold War. It displays original artefacts, documents, photographs and audio-visual material about the checkpoint and it provides an overview of the German reunification process.
It was opened by German Chancellor Angela Merkel on 14 September 2011. In its first two weeks more than 30,000 people visited the museum. Entrance is free.