This excellent site (in Dutch) presents a page of thumbnail images of all the Dutch hunebedden.
Clicking on any of these images opens a page dedicated to that hunebed, presenting a photogallery of images, a Google Map with marker, plus thumbnail links to other hunebedden in the vicinity.
In some instances, there is also a short YouTube video showing the hunebed in its surroundings.
Informative, and very much recommended.