Blast Door II One of the many blast doors. Note the plunger to seal off the airflow in the event of an attack or accidental explosion. Similar Images ...based on the tags: blast-doors, green, grimy, rusty, steel... The conveyor between the shore and Dock 2. Note the gap in the aerial walkway that used to connect Dock 4 to the rest of the complex. The walls of a dormitory dissolve in the water flowing through the bad roof. A common room with a big bay window that overlooked the main entrance of the hospital. This ruined skyway looks like it should be at ground level because of the growth, but it’s actually the second floor of the building. A ship passes the abandoned dock on its way to Duluth. Taconite dust stains the sides of its hull red. The spiral staircase ends in the basement, where two oil tanks (for the lantern) and a freshwater tank (for the Keeper) were stored. The basement consists of two long arched vaults like this. Castle, Montana is a ghost town. Almost no signs remain that it was a mining town. Near the old slag dump there are the remains of the pouring buckets that received the molten steel from the US Steel blast furnaces, filled to the brim with pig iron. They must be incredibly heavy!