Plan of Cathedral at Mainz, AD 976
This is the plan of the Cathedral at Mainz, Germany. It is an example of Romanesque and Gothic architecture. The scale is in feet. Construction was started in AD 975. In Germany and Italy up until this point in architecture open timber roofing or flat ceilings were being used, however this problem was "solved in Germany, as well as in Italy, [with the] vaulting over the nave, and the cathedrals of Spires, Worms and Mainz are the three most important churches in which this was accomplished."