unreinforced concrete dome

Weekly Photo Challenge: Structure

At his week’s challenge is Structure and
Rounded

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Dome of the Pantheon

The domed ceiling of the Pantheon in Rome is an incredible structure that has stood the test of time. Completed around 126AD, almost two thousand years after it was built, the Pantheon’s dome is still the world’s largest unreinforced concrete dome. The height to the oculus  and the diameter of the interior circle are the same, 142 feet (43 m).