Every monument has an interesting story to tell. Head to Roman Circus and learn a bit about the city's history.
You're spoiled for sightseeing choice when in Old Town Tarragona. Roman Circus is a great place to kick off here, but there are lots of other fine attractions to enjoy. PortAventura World, Tarragona Amphitheatre, and Tarragona Cathedral are close to the commemorative structure and will top off your day nicely.