Constructed around 40 years later, the Pantheon houses a mind-bending dome that spans 43m of air and culminates in a pupil-like circular window at its apex known as the oculus that floods the interior with natural light. The name Pantheon, which combines the Greek words for "all" and "gods", suggests a religious function, but some historians think the monument was mainly constructed to pay tribute to Roman emperors. Despite the ravages of time, the iconic half-sphere remains intact and is still the world's largest unreinforced concrete dome.
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