The Statue of David is completely breathtaking. One piece of stone and the attention to fine fine details is completely stunning. Watch out though because the queues start as early at 0830 so, if you can't get there earlier I suggest you a) get an early train/start and book a Timed Ticket from the nearby Ticket Office or b) book on-line. Timed tickets are the only way to manage Florence or else or you'll spend hours in the heat and the queues of Florence.
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