Question: In which town in Tuscany can you find a gallery, considered the most important and most visited, which houses the Portrait of Lucrezia Panciatichi?
Sentence (from "Art Treasures Exhibition, Manchester 1857"): It attracted over 1.3 million visitors in the 142 days it was open, about four times the population of Manchester at that time, many of whom visited on organised railway excursions.
Relevant evidence: No