On the Appia Antica there is a small and delightful church called "Domine Quo Vadis".
It was built in the place where, in the time of Nero, the Apostle Peter, while escaping his captors and headed for salvation, miraculously would have met Jesus and would have asked him the famous question; "Domine, quo vadis?" (Lord, where are you going?).
According to tradition, Jesus replied: "Venio iterum crucifigi" (I come to be crucified again).
Peter understood the message and, retracing his steps, faced martyrdom and was crucified upside down in Nero's Circus.
In the ninth century, in this very place, a chapel called "Santa Maria delle Piante" was built, by virtue of a stone on which the footprints of Jesus were imprinted.
The church that we can admire today is the seventeenth-century reconstruction of this chapel.
On its perimeter one can observe the footprints of Christ (very large indeed).
However, the original footprints can be seen in the Chapel of the Relics, which is located in the nearby Basilica of San Sebastiano Fuori Le Mura.
In the same chapel there is another interesting relic: one of the arrows that martyred Saint Sebastian at the time of the emperor Diocletian and his persecutions against Christians.
Francesco Petrarca, in a letter to Cardinal Colonna recalls the stone with the footprints of Jesus' feet as an "adored vestige".