The Sinteranlage was built in 1910, rebuild after the war and was shut in 1995 by Thyssen Krupp after the neighbouring steel works, which were fed by the Sinteranlage, closed their doors.Sintering is a method for making objects from powder. The powdered iron ore and coke is mixed, compressed and then heated inside the Sintering furnace shown below. The end product are solid pellets which are then further used in steel works. As the furnaces were suspended over a big drop, I'm guessing only few people have ever been inside them. Touching the inner walls of the furnace results in powdery material falling of the walls. Being surrounded by these thick heat resistant walls covered in dust, dust that has been there since the last day of Sintering probably back in 1995.