Visitors walk behind an ancient marble head of ancient Greek warrior-king Alexander the Great, displayed at the Acropolis museum in Athens, Oct. 12, 2014. Alexander the Great was one of the world's most successful military commanders, who enlarged his father's kingdom to include an empire stretching from modern Greece to India. During his youth, Alexander was tutored by the ancient Greek philosopher Aristotle until the age of 16. (AP Photo/Petros Giannakouris)
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