As one of the New Seven Wonders of the World, the Roman Colosseum is the world's largest type of what arena?

The Colosseum is the largest Roman amphitheater of its kind. Standing 158 feet tall and stretching 512 by 620 feet, the Colosseum seated some 50,000 spectators in its day (80 AD), who all came to watch the gladiator shows and other spectacles held there.

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