The Piazza della Signoria has the Fountain of Neptune by Ammanati, statues of Hercules and Caco by Bandinelli, a copy of David by Michelangelo, Cosimo I on horseback, Judith & Holofernes.
In the Loggia della Signoria: sculptures of The Lion by Vacca, The Rape of the Sabine Women by Giambologna, Menelaus supporting the body of Patroclus, Hercules & the Centaur by Giambologna, The Rape of Polyxena by Pio Fedi, Perseus by Cellini.
In the Palazzo Vecchio, its Courtyard is by Michelozzo, rooms & corridors have elaborate fresco ceilings, the Salone dei Cinquecento was designed by Cronaca with frescoes by Vasari, the Chapel of Eleonora of Toledo by Agnolo Bronzino. Sculptures include: Hercules and Diomedes by Vincenzo de Rossi, Putto with Dolphin by Verrocchio, Judith & Holofernes by Donatello. Paintings & frescoes: St Johns Day Fireworks in Piazza della Signoria by Stradano, Life of Furius Camillus by Salviati, frescoes by Ghirlandaio in Hall of Lilies. And the Death Mask of Dante.
From the Palazzo Vecchio tower, you look down on the Piazza di Signoria & Uffizi Gallery Cortile. Have 360 degree views of Florence & good views of Cattedrale di Santa Maria del Fiore, River Arno, Basilica Santa Croce.