Brescia - Duomo Vecchio

The "Duomo Vecchio" (aka "Concattedrale invernale di Santa Maria Assunta", "La Rotonda") is a large circular structure erected on the site of a prior basilica in the first half of the 11th century.
This basilica ("Santa Maria Maggiore") was built within the 6th century. When the relics of Saint Filastrio (aka "Saint Philastrius"), the 6th bishop of Brescia and a preacher against the Arians, were transferred to Brescia in 838, this large crypt was built under that basilica.

This crypt was built using materials from Roman ruins, so none of the pillars here match. Some of the pillars developed cracks - and so got reinforced by a metal ring.