The Ströer Group (specialists for out-of-home-media, based in Cologne) wants to contribute to a positive urban image – not only by an exceptional quality of exterior media, but also with engagement for Cologne Cathedral, the town's landmark of Cologne where the company is domiciled.
In order to help preserving Cologne Cathedral the Ströer Group supports Central Cologne Cathedral Building Society (ZDV) by making free advertising time available on information screens in underground stations in Cologne's subway.