4World’s Largest Unreinforced Concrete Dome

The Pantheon’s dome is a masterpiece of design and an engineering marvel. It remains the world’s largest unreinforced concrete dome.

The dome’s thickness tapers from 6.4 meters (21 feet) at its base to just 1.2 meters (4 feet) at the oculus. This architectural innovation was groundbreaking for its time and remains awe-inspiring today.

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