Water management maps (1600-1825) - University of Utrecht is a digital exhibition with a good number of maps georeferenced.
The georeferenced details of the maps can be fetched, including an XYZ link .
For example: Het Hooge Heemraedt schap van Schielandt
XYZ Link: http://maps.georeferencer.com/georeferences/6d7066ea-e879-5524-be46-d3410e60f272/2019-03-20T14:11:11.576986Z/map/{z}/{x}/{y}.png?key=uWzLmpU4WYt8NfoiAg9N
However, when adding the map via xyz link in Placemark, despite a layer is successfully added, the map does not up.