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Athenian rulers began construction of the Temple of Olympian Zeus (Naós tou Olympíou Diós) in the sixth century BC. By the time Roman Emperor Hadrian completed it 600 years later, it was the largest temple in Greece, and its statue of Zeus—king of the gods of Mt. Olympus—was one of the largest in the world. The temple began to fall into ruin shortly after it was finished; today only 15 of its original 104 columns still stand and much of its marble has been recycled or stolen for other temples. Nonetheless, what remains is a truly impressive sight to see.