Tarragona, one of the cities with more history in Europe. It is bathed by the Mediterranean, which makes it very rich in Roman heritage. From Barcelona it only takes an hour and a bit, which makes Tarragona a recurring destination when visiting Barcelona.
Touring all of Tarragona's Roman heritage is incredible. You will be able to see the amphitheatre, the circus, the Forum square, an aqueduct... You can arrive with your own car or with a rental car. Going by car will allow you to have the freedom to see the whole coast and to escape to any other place.
If you have to rent a car, with Amovens you will find cars at a very good price, fully insured and without having to pay a deposit. Don't miss out on the Roman ruins because you don't have a car.