That's a view looking west along Addison, about seven blocks west of Wrigley Field, at the new L station on the CTA's Brown Line.
The little squiggles on the brick are art. Yes, art. They are, according to chicago-l.org, "Ron Santo's handwritten box score symbols describing the May 14, 1969 Cubs-Padres game".
OK, first, take the leap of faith that Ron Santo actually scored that game -- either then, or years later. In any case, check out the boxscore and play-by-play from that game. The Cubs won that game by scoring two runs in the bottom of the 9th -- here's the PBP from that inning: