"World record at the top of Prague"

http://uwepetercom.blogspot.com/2010/08/world-record-at-top-of-prague-hradschin.html
Hradschin | Prague | Czechoslovakia | 2010-08
According to the Guinness Book of World Records, the Prague Castle (Hradschin) is the largest coherent castle complex in the world with an area of almost 70000 m², being 570 meters in length and an average of about 130 meters wide.