El Jem. Tunisia. View of arched entry that leads to the first level of seating at the magnificent honey coloured ancient Roman amphitheatre. Dating from 230-238 AD, the splendid Roman amphitheatre or Colosseum of El Jem is the third largest in the Roman world and is one of the most impressive Roman monuments in Africa. The Colosseum of El Jem is a UNESCO World Heritage Site.