Modeled after Rome's Pantheon, this circular basilica is the centerpiece of the Piazza Plebiscito and is one of Italy's most frigidly voluptuous examples of the Stile Empire, or Neoclassical style. Commissioned by Ferdinand I to fulfill a vow he had made when enlisting divine aid to be reinstated to the throne of the Kingdom of the Two Sicilies, it rose at one end of a vast parade ground built several years earlier by Joachim Murat. Completed in the late 1840s after 30 years of construction, the basilica transformed Murat's grandiose colonnade—clearly inspired by the colonnades of St. Peter's in Rome—into a setting for restored Bourbon glory.
Pietro Bianchi from Lugano in Switzerland won a competition to build the slightly smaller version of the Pantheon. Although it has a beautiful coffered dome and a splendid set of 34 Corinthian columns in gray marble, its overall lack of color (so different from the warm interior of the original Pantheon) and its severe geometrical forms create an almost defiantly cold space.
Art historians find the spectacle of the church to be the ultimate in Neoclassical grandezza (greatness); others think this Roman temple is only suitable to honor Jupiter, not Christ. In any event, the main altar, done in gold, lapis lazuli, and other precious stones by Anselmo Caggiano (1641), was taken from the destroyed Church of the Santi Apostoli and provides some relief from the oppressive perfection of the setting. On a hot summer day, the church's preponderance of marble guarantees sanctuary from the heat outside, with a temperature drop of 10 or more degrees.