The Loggia is located at the intersection of three of Siena's largest streets: the Banci di Sopra, the Banchi di Sotto (which was also a branch of the important Via Francigena that used to run through the city), and the Via di Citta. Most tourists entering the city passed by it at least once. It was built in the first half of the 15th century, and the upper floor was added in the 17th century. The Loggia was built on the back of the merchant's building that faced out onto Il Campo.
The structure itself has a rectangular covered gallery that is open on three sides, with an upper, enclosed area above the entire gallery. The facade is characterized by three arches on ornately decorated pillars. There is an arch on each of the two shorter sides. The ceiling frescoes are vaulted. There are five statues from the second half of the 15th century on three columns, representing St. Paul's Street, St. Peter's Street, and three patron saints of the city of Siena.
The vaulted ceilings and part of the rest of the loggia were redesigned in the 19th century.
The loggia is permanently blocked by a high metal fence, so unfortunately you can only see the ceiling frescoes from the street.