These Roman ruins, in fact ruins of roman pillars are located right in fron to the Basilica of San Lorenzo. These pillars date back to the 2nd century AD and pertained to Roman temple. They were somehow moved from their previous location durinf the 4th century.

Piazza Mercanti is a central city square. It is located between the two other important squares. Cathedral square which could be considered as another central square and the Cordusio square. Piazza Mercanti lived its most glorious days in the Middle ages when it was the real city centre. There are many important historical monuments that are build on the edges of the square.