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What was an innovation of the Roman Pantheon?
It had the largest free-standing dome in the world.
It used a combination of concrete and glass.
It was built using hydraulic power.
It was the only concrete building in the world.
I don't recall seeing glass in the Pantheon.
It was built using slave labor
Much of Rome was built using concrete in those days.
Answer - largest free standing dome in the world. I believe it held that record for over a thousand years, until the dome in the Vatican was built.
http://en.wikipedia.org/wiki/Pantheon,_Rome
How the Romans introduced concrete