The interior of the Pantheon in the 18th century, painted by Giovanni Paolo Panini[40] (Source)
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An 1836 view of the Pantheon by Jakob Alt, showing twin bell towers, in place from early 17th to late 19th centuries (Source)
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View of the Pantheon in Rome, including the concrete dome (Source)
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The Pantheon dome. The coffered dome has a central oculus as the main source of natural light. (Source)
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Floor plan of the Pantheon from Georg Dehio/Gustav von Bezold: Kirchliche Baukunst des Abendlandes. Stuttgart: Verlag der Cotta'schen Buchhandlung 18871901. (Source)