GIS Data and Maps: Europe
https://olinuris.library.cornell.edu/map-collection
List of websites with maps of Europe and European countries.

INSPIRE
http://inspire-geoportal.ec.europa.eu/
Provides the means to search for spatial data sets and spatial data services, and subject to access restrictions, to view spatial data sets from the EU Member States within the framework of the INSPIRE Directive.

Europe Maps: Perry-Castañeda Library Map Collection
http://www.lib.utexas.edu/maps/europe.html
Chiefly links to European maps produced by the United States Central Intelligence Agency.

International GIS Data: Europe
http://guides.library.upenn.edu/content.php?pid=324392&sid=2655132
Guide produced by the Pennsylvania State University Libraries.