Even today, almost 2000 years after its construction, the Pantheon is a remarkable building to see. It’s a striking reminder of the architecture of the great Roman Empire.
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The most fascinating part of the Pantheon is its giant dome, with its famous hole in the top (the eye of the Pantheon, or oculus). The dome was the largest in the world for 1,300 years and until today it remains the largest unsupported dome in the world.
The dome is 43.3m (142ft) in diameter and is in perfect proportion with the Pantheon by the fact that the distance from the floor to the top of the dome is exactly equal to its diameter.
The hole (oculus) is 7.8 meters in diameter and was the only source of light. Rain occasionally falls through it, but the floor is slanted with drain-holes which drains the water if it manages to hit the floor.