The port for the city Antioch was a considerable distance from the city, a full 18 miles over rugged terrain. But this is where Paul and Barnabas would have sailed from to go to Cyprus, and where they came back to after the first missionary journey. Today there is little to see of the ancient port, but it was an important port in ancient times, especially for the Romans as they built their Empire eastward. Here are some shots of the remains of the ancient port…
But this was not the only Roman construction project in the area… there was also the gigantic tunnel being dug as a conduit for water, a construction begun by Vespasian, continued by his son Titus, so the commission began in 69 A.D. but the completion of the first part of the project came in 81 A.D. The second phase of the project was not completed until the time of Antonius Pius 138-61. The point of the project was to control the huge amount of water pouring down the mountains and inundating the seaport city. Here are some shots of that tunnel— dug by soldiers and many many slaves. And in an age before dynamite and similar explosives, this was an unbelievable accomplishment as you will see. 
The name of those commissioning this construction can be seen on the wall in the upper right of this picture. Here are some more shots. The first and third of the shots below make clear the sheer depth of the tunnel.
It is worth stressing that many of these ancient sites in Turkey are not handicap accessible. Several of them were a hard go for my wife, seen above, and myself, now in our mid-70s.
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