The Mauerpark is situated in Prenzlauer Berg, in an area that used to be enclosed by the Berlin Wall. The Mauerpark is very much a "people's park". On hot summer evenings it can be crowded with spontaneous parties and music. It was like that when we were there.. all kind of people, drinking beer and relaxing.I also heard that on Sundays a flea market is held next to the park.After Mauerpark