Something tells me "definitely not"...but I wasn't able to find anything conclusive on the site.
These should all be public domain. Is there anyone besides Google and the Vatican that watermark public domain works?
I'm pretty sure the Vatican's got to "ruin" the images with a watermark or anyone would be able to use them as is for whatever they want. It'd be different if it was sculpture, but these pics seem to me like they'd definitely fall into the "slavish reproduction of a public domain work" category.
[0] http://fairuse.stanford.edu/overview/public-domain/welcome/#...
Some of the early maps of Ireland (from 1840s) have been scanning and rectified and put online by the Ordenance Survey of Ireland. But they're all copyrighted by them, and you can't have them. (they're viewable here http://maps.osi.ie/ )