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| Album: By Country | By Date | Italy | February 2001 | < Prev Image | Walking About Rome | Next Image > | ||||
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| Travelogue: By Country | By Date | Italy | February 2001 | |||||
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The Pantheon's only light comes from a hole in the top of the dome, called the oculus. The dome's builders carefully selected and graded the aggregate material used in the dome's concrete. It ranges from heavy basalt in the foundations of the building and the lower part of the walls to the lightest of pumice toward the center. In addition, the uppermost third of the cylinder of the walls, seen from the outside, coincides with the lower part of the dome, seen from the inside, and helps contain the thrust with internal brick arches. The cylinder has walls that are 20 feet thick. |
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