SHADOW GUIDE on Instagram: "Prussian Royal Mausoleum and the grave of the first German Emperor. 1810 Following the sudden death of Queen Luise of Prussia (1776-1810), Frederick William III (1770-1840) had a mausoleum built for his beloved wife at the end of an avenue of fir trees. Heinrich Gentz designed plans for the building in the form of a Doric temple with a four - columned gable front, based on the king’s conceptions and in consultation with Karl Friedrich Schinkel. At first a bust of the