Berliners embrace their green spaces and the long strip of grass along the middle of Prenzlauer Berg’s Mauerpark (open daily from 8am–sunset) is best known not as a relaxing spot but a mecca for energetic market-lovers. The park hosts a massive flea market on Sundays, with vendors selling bargain bicycles, clothes, food, souvenirs, records, pianos and furniture. At 3pm, the hillside becomes the setting for karaoke on a giant scale. Bearpit Karaoke is for the vocally fearless: take the mike in front of a sprawling crowd or join in on the rousing chorus but be warned, the emphasis here is entertainment, rather than quality singing.