In The Fires of Vesuvius, Mary Beard says he Temple of Apollo once held a pair of bronze statues of Apollo and Diana and a copy of the omphalos (navel) that was a symbol of Apollo at his Delphic shrine.
House of the StagsMt. Vesuvius - What You Need to Know About Mt. VesuviusPhoto Gallery of the Ruins of Pompeii
An Introduction to Wall Inscriptions from Pompeii and Herculaneum - R.E. WallaceOpus CraticumPompeii - Robert Harris