These days, mosques in Germany are as diverse as the Muslim communities they represent. There are those that reflect the architectural tradition of classical Ottoman mosque design, but Germany has in the meantime also become home to several modern and innovative mosques such as those in Penzberg or the Cologne district of Ehrenfeld. Every year on October 3, the mosques operate an open-door policy for interested visitors. But in actual fact, it's possible to visit a mosque at any time.