I have just been rediscovering Art Project Powered by Google. The project gives you a virtual view of several famous galleries in google street view and you can also browse the art works and read about them. I found out about it months ago, and have come back for another explore round all the galleries. They have added more features too, such as video media for some paintings.
The photo quality of the paintings are very good, look how clear this detail is. It is from The Merchant Georg Gisrg Gisze by Hans Holbein the Younger.