The Atlas of Europe website now includes several interactive physical maps; for example the clickable map showing European rivers (http://www.euratlas.com/Atlasphys/hydrography.htm), and mountain ranges (http://www.euratlas.com/Atlasphys/Orography.htm). Some nice effects.
(Euratlas also features maps of Ancient Rome, historical atlases, and other resources. And as far as I can see, it’s all free.)
