We went to Rome with my DN who was 13. He loved all of the history but his highlights were: 'Scavi' tour underneath St Peter's (need to book early) Climbing St Peter's Cappuchin Crypt Catacombs tour Pizza and Gelato making workshop Day trip to Pompeii Gladiator show a Guppo Storico Romano (it wasn't as cheesy as I thought it would be!)
My ds ( 20s) always does a city break with my dsis in Feb half term , they are off to Lisbon this week , last year they did Bucharest and went to Bram castle / Peles for a day trip . St Petersburg was very interesting . I wouldn’t do a day trip to Pompeii from Rome , we did it years ago and it was too much in a day . Barcelona is lovely .