Sparta _existed_ for 500 years; they flourished for zero. They existed at the cost of innumerable distorted or ruined lives, and contributed nothing to the human patrimony except possibly the idea of totalitarianism (which is not much of a contribution).

They fell well before the Macedonians, too: a commander of a minor city -- Corinth, I think -- noticed that the Spartans always used the exact same tactics, deployed his troops in a preposterous formation that ensured that the Spartans would lose if they changed nothing, and won decisively. The Helots immediately revolted and recovered their independence, and that was the end of Sparta.