The Sanctuary of the SS. Trinità, built in the 11th century, is renowned throughout history because numerous popes prayed here, including Pius IX, sovereigns, bishops and saints, including Bernardino of Siena, Ignazio di Loyola, Leonardo da Porto Maurizio and San Filippo Neri.
Legend has it that San Filippo Neri lived inside the Split Mountain where there is a stone bed still known today as “The bed of San Filippo Neri”.
Along the walls of the rock, it is possible to admire the majolica panels of the stations of the Via Crucis, partially restored, dating back to 1849 and attributed to S. Bernardino da Siena, containing the verses of Metastasio.