The two façades are identical in feature and each is in itself perfectly symmetrical, except that the capitals of the two middle columns on the southern façade, instead of having the angle of the abacus supported by volutes, have eagles in their place. The square niches have had each their separate entablature, and columns supported by sculptured brackets; all the arches have archivoltes.
The mass of the monument is of sandstone, but the columns, capitals and bases of the pilasters, brackets and entablature are entirely of white marble, as was also the crowning of the attic; the sides of the attics were certainly covered by slabs, most probably of the same material. The débris from the entablature and the upper part of the building has fallen round the base of the monument, burying it as far as the imposts of the lower arches.
M. Masqueray has found amongst the ruins of the Byzantine Citadel an inscription which proves that this building was called the arch of the Gods, ARCVM PANTHEVM, and that it was customary to ornament it with statues, some of which may probably still exist amongst the stones and soil with which the base is encumbered.
IMP. CAES. M. AVRELIO. AN
TONINO PIO FELICE. AVG
M. POMPEVIS. PVNTINVS. SVE
PL. PP. OB. HONOREM. FLAMONI
SVPER. LEGITIMA. ET. STA
TVAM. MARTIS. AD. AR
CVM. PANTHEVM. SVM.