Under the Cathedral's portico were the stalls of the moneychangers who did business with pilgrims on the Via Francigena, the ancient road to Rome that passes through Lucca: hence a monumental inscription reminding moneychangers not to defraud customers. The mysterious labyrinth carved on one of the pillars may also be a symbol of pilgrimage, or an artistic work related to the Templars, as it is very reminiscent of the one on the floor of the Cathedral in Chartres.
The three-aisled interior is an atmospheric setting, thanks to its Gothic forms, and it preserves many works of art such as the Madonna Enthroned with child and saints by Domenico Ghirlandaio and the Last Supper by Jacopo Tintoretto.
The Cathedral also preserves the Holy Face, a wooden crucifix that according to tradition was made by Nicodemus based on the real face of Jesus. The statue was placed in a splendid 15th century small temple by Matteo Civitali.