BC Silver School, is an abandoned public school in Spryfield, which is covered in ever changing graffiti. It is due to be torn down sometime soon - so make sure you see it while it is still standing.
The Pit is the 'Legal' wall surrounding the parking lot at Water and Morris Streets. An amazing amount of great graffiti goes up here on a regular basis. Here's what's currently up, and blasts from the (recent) past.