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While you're at Piazza Maggiore, be sure to check out the adjacent Palazzo del Podestà and discover its secret: the Whispering Wall. This architectural wonder allows whispers to carry across the arches to the opposite side, originally serving as a means of communication during the plague. For those wishing to soak up more history, the Basilica of San Petronio is a must-visit. It is the largest brick Gothic church in the world, and while entry is free, there are strict dress codes that should be noted.