Jeff Woo: The highlight of the piazza is Loggia dei Lanzi: used in 1382 to hold public ceremonies. Today, it's like an open air art museum with many interesting statues.
Podere il Pino: The buildings are part of the UNESCO World Heritage Site. Before the modern era, the dome by Filippo Brunelleschi was the largest in the world. It remains the largest brick dome ever constructed.