Roskilde Cathedral - Denmark

Besides Copenhagen, I also want to visit other places nearby. Roskilde is not far from Copenhagen but there are two other UNESCO places in the area that I'd like to visit.
The 1st of these cards was also sent by Margarida and the other one by Genek.

Built in the 12th and 13th centuries, this was Scandinavia's first Gothic cathedral to be built of brick and it encouraged the spread of this style throughout northern Europe. It has been the mausoleum of the Danish royal family since the 15th century. 

Porches and side chapels were added up to the end of the 19th century. Thus it provides a clear overview of the development of European religious architecture. - in: http://whc.unesco.org/en/list/695