Michelangelo's marble sculpture of David is located in Piazza Vecchio. It was presented to the Florentine public in 1504. According to history, the statue was supposed to placed inside the cathedral but was instead erected in the Piazza.
After Michelangelo's David, he was called by the Pope to paint the Sistine Chapel. Michelangleo's work is scattered around Florence and Italy as well.
It was a beautiful piece of work. We were definitely awestruck.