Tunisia hosts some of the best-preserved Roman and Punic sites in North Africa. : Visit the Baths of Antoninus
Most guidebooks mention Roman ruins. The Tunisia LP PDF includes detailed historical timelines that explain the Punic Wars. You will understand why the Romans salted the earth of Carthage, turning a walk through the ruins from a pile of rocks into a moving historical experience.
A Lonely Planet Tunisia guidebook would likely highlight the following must-visit destinations:

