One of the many benefits of traveling to the lands where biblical events occurred is that of gaining insight into just how pervasive idolatry was. It has always been necessary to make a choice of who you will serve (Joshua 24:14-15). Temples devoted to many gods abounded. The Gospel reveals the true God who claims exclusive service and worship to Him alone.
At Hierapolis one can view the ruins of the temple of Apollo.
Currently at Istanbul, we look forward to our flights home tomorrow.