Rome layers the Colosseum and Forum, the Vatican's Sistine Chapel and Saint Peter's, and Trastevere's ivy-covered trattorias across a city where every neighbourhood reveals another Bernini fountain or Caravaggio chapel.
Wisteria across Trastevere and pink judas trees at the Roman Forum, Holy Week processions through Easter, and gelato season properly underway by Liberation Day.
Hits 35°C and the Vatican Museum queues become punishing without timed entry, but Estate Romana fills nights with film screenings on Tiber Island.
Romaeuropa festival across the city, vineyards in Castelli Romani at harvest, and the Forum and Palatine pleasant in golden October light without summer queues.
Christmas Mass at Saint Peter's, Befana market at Piazza Navona through January 6, and the Pantheon's oculus dramatic with rare Roman snow most years.