AIr Vent & Lamp House On the left you can see one of the later air shafts for the mine below, which allowed for natural air exchange with the main production areas of the coal mine. That is to say, there were no fans blowing fresh air down below. Similar Images ...based on the tags: green, mine-shafts, rooftops, towers, trees, vents... A huge vent looks like it built in a hurry. There was actually very little in the way of bits of machinery left over… I am guessing almost anything of value was scrapped in the 1990s. One of the large barracks. All of them are overgrown like this. Looking down the kiln line from atop the furnaces. The dredge is divided into four levels. The top level has controls for the tailings boom and, when it was there, the bucket excavator. The main street of the ghost town is also the maintenance road for the BNSF line that bisects Colmor. My favorite shot of the 17-story Art Deco office tower attached to the train station. A rooftop scene. Looking toward the famous Duluth Aerial Lift Bridge from Lake Superior. Shot on a the legendary Pentax 67. The spectacular, if precarious, view of downtown Minneapolis from the roof of ADM Annex 4. Note the great messages left by various graffiti artists who made it to the spot.