After catching a ferry back to the mainland, Katie and I took an overnight train from Athens to Thessaloniki. From there we hoped to take a train to Belgrade (Serbia) and then onward to Sarajevo (Bosnia and Herzegovina), where we planned to spend a few days. As it turned out, there were no trains departing Thessaloniki for anywhere outside of Greece, so, our best (and only) option was to take a bus to Sofia (Bulgaria) where we could get on another overnight train to Belgrade and from there, finally, catch a train to Sarajevo. You may have noticed that our mistake was trying to get from Kea to Sarajevo without…