Set among the ruins of Trajan's Forum, Trajan's column (AD 113) is adorned with a stunning spiral frieze recounting the Romans' victorious campaign against the Dacians (from modern-day Romania). It later served as Trajan's tomb – his ashes were interred in a room inside the column's hollow base – and was crowned by a statue of the emperor. In the late 16th century, Pope Sixtus V replaced this with the statue of St Peter that you see today.

Casts of the column and its intricate reliefs at the Museo della Civiltà Romana will spare you the sore neck.