European Library access

This URL allows you to search the holdings of European libraries.
http://www.theeuropeanlibrary.org/portal/index.html
You can search the "collections by theme"
posters and images
music collections
childrens literature
manuscripts
digitized books
maps & atlases, cartography
newspapers
portraits
scientific articles

There is also a section which allows you to search the "Treasures" at the national libraries in various countries.