Tunisia - Dougga / Thugga

"Before the Roman annexation of Numidia, the town of Thugga, built on an elevated site overlooking a fertile plain, was the capital of an important Libyco-Punic state. It flourished under Roman and Byzantine rule, but declined in the Islamic period. The impressive ruins that are visible today give some idea of the resources of a small Roman town on the fringes of the empire." 

Source: UNESCO World Heritage