Pantheon

Building in Rome begun 27 BC, probably as an ordinary rectangular Classical temple, and completely rebuilt by Hadrian (c. AD 118–128). It is remarkable for its size and design; the exact method of construction has never been determined. A circular building of concrete faced with brick, it has a great concrete dome, 142 ft (43 m) in diameter, and a front porch of Corinthian columns with a triangular pediment. The vast space is lit solely by the 27-ft (8-m) oculus at the dome's centre. The interior is lined with coloured marble, and the walls are marked by seven deep recesses screened by pairs of columns.

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