Brave the crowds again and head for the Colosseum/Forum/Palatine complex. Half circus, half sports arena, Rome’s most famous classical ruin is unmissable – especially now that they have extended the visitor route to the underfloor passageways through which gladiators and wild beasts made their entrances. Walk from the Colosseum though the Forum to the pretty Palatine Hill, where Romulus legendarily founded Rome, and where emperors such as Augustus built their palaces.
If the throng proves too daunting, head to nearby San Clemente (Via Labicana 95), one of Rome’s most worthwhile but least publicised sightseeing treats. This historical layer-cake descends from a street-level medieval and early-Renaissance church, with frescoes by Masolino, via a fourth-century early Christian church to the basement remains of a second-century insula (apartment block), complete with shrine to Mithras.