The interior of the abbey Basilica is the result of significant 20th-century restorations, carried out between 1905 and 1914, whose declared aim was to restore it to its original character, dating back to the 11th and 12th centuries.

The three-nave plan ends with semicircular apses, with alternating pillars and columns that divide the main nave from the lateral ones; there are also the crypt, the raised presbytery, transept, and tiburium.

Foto Ciol