[dejv]

Well, it is actually bike path. I can't talk about whole road, but at the leg through the Czech republic is actually well marked on each intersection.

Here is a map I found: https://en.eurovelo.com/ev9 This route actually didn't end at Venice as it suppose to end (and didn't pass through the Baltic states), but it is nice overview.

[xorcist]

Thank you! That turned out to be a great resource.

I have previously looked at something called the Trans Dinarica, a 2000km mountain bike trail through beautiful terrain in the Dinarica alps. Maybe this is a bit easier alternative, while no less epic.