1. 
   Aachen Cathedral
   (from the article `Aachen`) ...principal coronation site of Holy Roman emperors and of German kings from the Middle Ages to the Reformation. The Palatine Chapel, a masterpiece ...
   Found op http://www.britannica.com/eb/a-z/a/1
   
   
2. 
   Aachen cathedral
   Markozeta (username), using Paint. For use on the relative density page. ...
   Found op http://en.wikipedia.org/wiki/Aachen_cathedral
   
   
3. 
   Aachen Cathedral
   Aachen Cathedral, frequently referred to as the "Imperial Cathedral" (in German: Kaiserdom), is a Roman Catholic church in Aachen, Germany. The church is the oldest cathedral in northern Europe and was known as the "Royal Church of St. Mary at Aachen" during the Middle Ages. For 600 years, from 936...
   Found op http://en.wikipedia.org/wiki/Aachen_Cathedral
   
   

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