What has become of the new splendor of yesterday? What does the New Berlin of fifteen years ago look like today? Is it already crumbling at Potsdamer Platz? Does the glass architecture still sparkle, and are all the vacant lots on Friedrichstrasse now built up? David Wagner strolls through the streets of the city again, visiting the squares and bars he described in his 2001 book "David Wagner in Berlin." "Mauer Park" combines these classic Berlin essays from the 1990s with new observations of the city. Read side by side, it shows how radically Berlin has changed and how much this city is doomed to constantly become. David Wagner marvels at luxury apartments on Schönhauser Allee, sits again in Café M, dances in the Flittchenbar, and drinks in Kumpelnest 3000. And he is astonished that the Wagenburg at Lohmühle now has its own mayor.