There is a search page for the collection that also include filters for such things as artist, date range, medium, etc.
It is great that they provided images with this level of detail. Here are just a few examples:
You can see the cross hatch patterns in Abraham Francen, Apothecary by Rembrandt van Rijn
You can even see the individual dot of paint in Georges Seurat’s A Sunday on La Grande Jatte — 1884.