Aachen Cathedral by admin April 12, 2013 Aachen Cathedral, also called 'Imperial Cathedral' or Kaiserdom is a German Roman Catholic Church. It is the Oldest Cathedral In Northern Europe. 229 Aachen Cathedral, also called ‘Imperial Cathedral’ or Kaiserdom is a German Roman Catholic Church. It is the Oldest Cathedral In Northern Europe. next post Taj Mahotsav 2016: Your Tryst With Cultural Diversity in India