Trouw has a special Unesco World Heritage edition magazine in the Saturday newspaper for 10 weeks http://www.youtube.com/watch?v=wII4TEt5No4
. The first one came out yesterday. Unfortunately the quality of the paper is quite low and there's not a lot of in depth information in it either, but when you collect all the magazines you'll have more than 200 pages about UNESCO sites.
In case you missed it: you can buy past issues and a special binder at the Trouw webshop
, where they also sell booklets of 10 coupons for the Saturday newspaper. You can also buy the binder at Free Record shop