Several ancient structures may be seen along the Appian Way south of Rome. One of the most impressive is the Tomb of Caecilia Metella. The woman for whom this tomb is named was the wife of a certain M. Crassus who shared power in Rome with Julius Caesar and Pompey.
The decorations on the tomb seem to date it to the beginning of the Augustan period (Wycliffe Historical Geography 538). I think we can safely conclude that Paul passed this structure on his way to Rome (Acts 28:13-14).