because this would have required frequent repairs. Instead, the roof was laid with glazed tiles, fixed with copper wire. The church consists of an arched vault with 3 naves over the outline of a Latin cross. Because of their lighter weight, the arches are built of artificial tuff stones. due to its lighter weight. The high bell tower stands in front of the short nave, with the Memorial Hall in its ground floor. The facades have no steady contours. In the spirit of the Gothic style, it is dominated by the split form, which doesn't leave any larger surfaces, but instead surrounds the whole structure with alternating with abutments and window hinges. The roofs are covered with different coloured glazed tiles that build small diamond patterns. Memorial Hall The Memorial Hall is situated in the ground floor of the tower. Like the tower, this has a hexagonal layout. It was a deliberate choice to situate the Memorial Hall in front of the main entrance, as that was the only place where visitors to the church can see the witnesses of the Protest, as their statues were not allowed to be situated in the interior of the church. A bronze likeness of Martin Luther stands on a pedestal made of Swedish granite in the centre of the Memorial Hall. This was a donation from the German-American Lutherans. In his left hand Luther is holding an open Bible, and his right hand is formed into a fist. With his right foot he is stamping on the papal bull of excommunication. Sunk into the ground are the words to remind of Luther's appearance at the Diet of Worms in 1521 ("Hier stehe ich, ich kann nicht anders, Gott helfe mir. Amen!", which mean "Here I stand. I can do nothing else, God help me. Amen.") Statues of the six princes who protested at the Diet of Speyer on 19 April 1529 are situated on six further pedestals: Elector of Saxony, John the Constant Ernest I, Duke of Brunswick-Lüneburg Duke Franz of Braunschweig-Lüneburg Prince Wolfgang of Anhalt George, Margrave of Brandenburg-Ansbach Philip I, Landgrave of Hesse At the intersections of the archway ridges in the archway are the coats of arms of the subscribers. In the haunches of the neighbouring portals are the coats of arms of the 14 Imperial cities which affiliated themselves with the Speyer Protest (Strassburg, Augsburg, Ulm, Constance, Lindau, Memmingen,