Leverkusen's a city in North Rhine-Westphalia, Germany. It's located on the eastern bank of the Rhine, half way between Cologne and Düsseldorf. History Dating to the 12th century as Wiesdorf, the Leverkusen area was rural until the late 19th century. Chemical facility: In 1860, Wiesdorf was chosen by the apothecary Carl Leverkus for establishing a dye factory. The factory was taken over by the Bayer company in 1891. The company moved its office to Wiesdorf in 1912, turning the town into th… (More on Leverkusen)