Mauerpark is a park built on a killing ground, and it has become the most cheerfully chaotic green space in Berlin. Three kilometres along the seam where the city was cut in two — the Wall, the Sunday flea market, the karaoke pit — ending where the East met the West under a railway tunnel.
This is a Sunday walk; do it any other day and you get a pleasant lawn and miss the whole engine. Start at Eberswalder Straße and follow the crowd west to the surviving Mauer, now a legal graffiti wall repainted every week on the line of the old death strip. Below it the Flohmarkt sprawls across the south end — vinyl, bikes, GDR relics, street food. Haggle.
The Bearpit is the middle of the afternoon: a stone amphitheatre where strangers sing karaoke to hundreds on a bike-powered PA. You don't have to sing. Sitting on the steps is enough.
Then north over Falkplatz into the quiet half, and through the Gleimtunnel — a sealed border crossing during the division, now just a cool dark passage with murals. It lands you at Gesundbrunnen and the way home.
