Given the cross-disciplinary nature of European Studies, you may also want to consult additional Research Guides
Recommended research guides to consult
Source: Wikimedia Commons' Atlas of Europe: Map of Europe with the names of the countries; Map of Europe 1905; Languages of Europe; Satirical map of Europe (1870).
The map traces changes in Europe's borders from 1000 AD until 2003, and was created using software from the Centennia Historical Atlas. Source: YouTube. Video link.