HI maurus. I've visited Denmark and this round tower in 1993. It was a very magic trip. I still keep very good memories of that travel. If i remember well this tower was round in order to grant access to horses.
Hi Maurus
thanks for comment about the rundetårn it is a very amazing building. here are some others and the roundtower. best regards jan
http://www.pbase.com/jan_pro/canon_d40