Routes we have actually done

Iberia by rail: Lisbon → Porto → Vigo → Santiago, 9 days.
Caucasus loop: Tbilisi → Kutaisi → Batumi → Tbilisi, 14 days.
Balkans overland: Dubrovnik → Kotor → Shkodër → Tirana → Ohrid, 12 days.
Baltic coast: Tallinn → Riga → Vilnius by bus, 8 days.

Each route has a post in the journal with costs and the mistakes we made so you do not have to.