We love industrial constructions. Two years ago we visited an abandoned military boiler room in Zielonka near Warsaw, Poland. The object is a property of the Polish army, but the entrance there was simple, easy. There is no soldier or even a security guard. You can enter the abandoned building surrounded by military objects. The photos below were taken two years ago, so you can admire a lot of industrial, well-preserved stuff. We returned to this place last summer and most of the equipment was stolen. It's so sad. So please remember about the rule: "take only pictures to leave only footprints".