In front of the church is the Sallustiano Obelisk, almost certainly brought to Rome by Lucius Domitius Aurelianus (Roman emperor, one of the most prominent rulers of the second half of the 3rd century).

The obelisk was originally located in the "Salustian Gardens." It is made of red granite and is 13.91 meters high and placed in a way as to correct the not quite axial position of the church in relation to the stairs.