This expansive civic space in front of Florence's fortress-like town hall, the Palazzo Vecchio, has been a social and political meeting place since the early 1300s. If the Duomo is the center of Florentine religion, Piazza della Signoria is the heart of the city's secular life.
In 1497 this was the scene for the original famous "Bonfire of the Vanities" when the followers of the so-called Mad Monk, Girolamo Savonarola, looted the surrounding wealthy houses and burned any objects (such as art and books) that might tempt the citizens into sin. As a consequence, a year later Savonarola himself was burnt at the stake in the same spot (marked by a plaque near the fountain).
Today, the heat is mainly reserved for making coffee and meals in the piazza's many cafes but things can still get feisty on May Day, when political speakers address the crowds from the town hall terrace. However, visitors are more likely to encounter pageantry than punishment, with the square regularly the stage for street musicians and displays of local historical customs (particularly in summer).
The Palazzo Vecchio is open to the public and, given that it has been a seat of government since 1299, contains lots of art depicting Florentine propaganda and military might. The statues outside continue the same theme with the exception of the copy of Michelangelo's "David."
Most pay tribute in some way to Cosimo I, one of the Medici family and the authoritarian head of the Florentine state from 1537 to 1574. It starts with an equestrian statue of him designed to liken his power in medieval Florence with that of the Roman empire. Then comes Ammannati's Neptune fountain (mocked by Michelangelo as a waste of fine marble), which intended to highlight Cosimo's prowess as a naval commander. After the "David" we get Bandinelli's "Hercules and Cacus," designed as Cosimo's personal emblem and symbol of Florentine fortitude. More impressive, in the corner of the arched covered enclosure nearest the town hall, is a copy of Cellini's bronze of "Perseus" holding the decapitated head of Medusa. Unsurprisingly, this was also commissioned by Cosimo to symbolize the triumph of his grand ducal rule over all other forms of government.