The “David” by Michelangelo, stands, as stated by Wikipedia and other official sites, at 5.17 m. tall (17 feet) and it is located at the Accademia Gallery in Florence, Italy.

This sculpture was created between 1501-1504 by Renaissance genius Michelangelo when he was 26 years old. The enormous block of marble used for the statue had been abandoned for 25 years in the courtyard of the Opera del Duomo. The sculpture was to be one of a series of statues with Old Testament figures, to be placed in the buttresses of the Cathedral of Florence.

Michelangelo's interpretation of this David is different from earlier versions by Florentine Renaissance artists, such as Verrocchio, Ghiberti, and Donatello, who showed a triumphant version of the young hero, standing victorious over Goliath’s severed head. Michelangelo chose to depict David before the battle: alert and ready for combat. He used the classical pose known as "contrapposto" or "counterpoint", where most of the weight is on one leg, so that the shoulders and arms twist off-axis from the hips and legs, giving the statue a more dynamic look.

The statue was too large and heavy to be raised to the roof of the cathedral. In June 1504, David was placed next to the entrance to Palazzo Vecchio, where it replaced Donatello's bronze sculpture of Judith and Holofernes. It took four days to move the statue the half-mile from Michelangelo's workshop to Piazza della Signoria.

More Info: en.wikipedia.org