Machinery Row's signature turret, on the corner where Williamson Street, John Nolan Drive, Wilson Street and Blair Street converge. The turret was once used by city police as a mortar nest, from which they bombarded traffic jams with six-inch shells to keep rush hour moving, a practice they ended when motorists began to return fire with scatter guns and Molotov cocktails. The craters in the streets have long since been filled in, but on a very humid day you can still catch a faint whiff of cordite in the air.

Back in reality, I have no idea why the building with the bike shop in it has a turret on the corner. I assume it was a machine shop way back when; it has the look of a heavy-duty building of commerce that's been refitted for more genteel pursuits.