Brick Graffiti on Boiler House An arrangement of brick graffiti on the old boiler house building near the railroad tracks. Similar Images ...based on the tags: black&white, brick-graffiti, carvings, contrasty, worker-graffiti... “R.S. ’14”. Brick Graffiti Series. This “pit” would allow workers to crawl below locomotives to service them. “Richard Glumac ’44”. Brick Graffiti Series. A 5-minute exposure of the tunnel and stars, and even some of Duluth’s city lights bouncing off the clouds. A single off-camera flash in the tunnel gives the effect of an oncoming train. Looking up to the second floor of the Nitrating House, where cotton would be soaked in nitric acid. These brought cotton into the building. A high-voltage tunnel sheathed in concrete dips below ground near a shell packing building that now stores fireworks. There’s no way an explorer, much less a choir, could stand here now. Since this picture was taken the roof has collapsed onto the loft. A Kiva is an underground, or partly underground, chamber for ceremonies. Looking out of the boarded windows in the Great Western Sugar office.