This impressive structure is the Amphitheatre of El Jem, in the Tunisian town of the same name. Made entirely from stone blocks, it was built in the 3rd century CE, when this area was Thysdrus, a city of ancient Rome. Once capable of seating up to 35,000 spectators, it is the largest colosseum in North Africa and one of the largest in the world. A UNESCO World Heritage Site since 1979, it is one of the best-preserved Roman amphitheatres, almost equal in grandeur to the Colosseum in Rome.