If you walk through the gardens of the castle of Schwetzingen, Germany you might be surprised to see a mosque standing there. Until 1785 a Turkish garden has been created with the so called Red Mosque within. It was just build for decorative reasons and was never intended for religious services.
It was built as the castle gardens are intended to show tolerance for all religions. In fact it was used by muslim prisoners of war after the German-French war in 1870/71. It is kind of strange that today a sign has to remind visitors that this is not a real mosque and that they should behave accordingly.
It is a nice place to walk around and enjoy Islamic art and the special atmosphere it creates.
Schloss und Schlossgarten Schwetzingen