This statue of d'Artagnan is at the back of a monument dedicated to Alexendre Dumas in the Place Malesherbes in Paris.
Too bad d'Artagnan did not get a statue of his own in Paris, as he was indeed a real person. Dumas inspired himself of romanced memoirs written by Gatien de Courtilz de Sandras to write his D'Artagnan Romances. The truth is d'Artagnan never served as musketeer under Louis XIII, but rather under Louis XIV.
As an aside, I have a love-hate relationship with Les trois mousquetaires, the first and best known novel of the serie. Despite being such a good read, it presents a very fictionalized version of history. To wrong things further, the novel has been very poorly adapted into movies several times, and each new version seem to retain less and less of the original story. That's why most people today think the Cardinal de Richelieu was a great vilain, while he was a very good, even if strong handed minister. In a time when the French nobility seemed to think conspiracy was a sport, the king's mother and brother first, Richelieu was able to take France out of its ruins. It is true that some heads rolled in the process, however. To set things straight, there never was any confrontation between the musketeers of Louis XIII and the guards of the cardinal. Richelieu even only reluctantly accepted to have guards after the king insisided that he should be better protected.
The real d'Artagnan was born in 1611 and later served in the Gardes Françaises until he became musketeer in 1644, the year following Louis XIII's death. He continued to serve the king after the dissolution of the company by Mazarin in 1646. When Louis XIV re-created the the musketeers in 1657, d'Artagnan was made their factual leader, gaining the full title of lieutenant in 1667. He notably arrested Fouquet at Vaux-le-Vicomte in 1661, and died during the siege of Maastricht in what is now Holland in 1672.