In 480 BC, a huge Persian army, led by the inimitable King Xerxes, entered the mountain pass of Thermopylae as it marched on Greece, intending to conquer the land with little difficulty. But the Greeks-led by King Leonidas and a small army of Spartans-took the battle to the Persians at Thermopylae, and halted their advance-almost. It is one of history's most acclaimed battles, one of civilization's greatest last stands. And in Thermopylae,...