I ve dozens of europenan bike route books picked over the years, that are mostly dreamt over than used...So so many choices..theres prob no one set route for each country...My favourite is Nick Cranes Cycling guide to europe in .which he gives a recommended routes for each country.Ive used his guide to Britain and ireland.Its been good ..My last few visits to europe have been French riveria,Haute Provence,Bavaria ,Switzerland, & Holland and more recently New england in the US..inspite of scouring the web for maps and routes beforehand have generally found the best cycling maps are bought locally when there.and in amercia in particlar found the route advice of local bike shops who know the area better.less a risk than DIY.I like to googleearth an area too