In Magdeburg, Saxony-Anhalt, Deputy Director Marlow of the Museum of Technology uncovered an old factory map of the Polte Armaturen- und Maschinenfabrik OHG, hidden in a bunker. The site, once home to the Polte works and later the Magdeburger Amaturenwerke, still contains five secret bunkers. This discovery highlights the industrial history of Magdeburg. Photo: Peter Gercke.