Paul wrote the following, from Corinth on his Third Missionary Journey, to the Church in Rome.
Rom. 15:18–19 "I will not venture to speak of anything except what Christ has accomplished through me in leading the Gentiles to obey God by what I have said and done—by the power of signs and miracles, through the power of the Spirit. So from Jerusalem all the way around to Illyricum, I have fully proclaimed the gospel of Christ."
Part of the heartland of Illyricum included modern day Albania. When would he have visited Illyricum? Possibly on his Second and/or Third Missionary Journeys. How would he have gotten there? It seems logical to assume that he would have traveled on the via Egnatia—as he did on his Second Journey from Philippi to Amphipolis, to Appolonia, to Thessalonica, etc. And from Thessalonica to continue on the same road to Illyricum!