It is almost impossible not to be aware of the amount of Roman ruins in Spain and Portugal. Below this introduction you will find a description of Italica near Seville, this is where I first realised that the Romans used concrete as well as stone and brick for their construction.
The Iberian peninsular was first visited by Phoenician traders as far back as 1500 BC who came in their ships from the area that we now know as Lebanon and settled all of the Mediterranean rim as far west as the Straits of Gibraltar. They did not come as conquerers but to trade with the locals, most of the major Mediterranean coastal cities were originally founded by Phoenicians.