Mixed masonry of the third century, from the circus of Caracalla Maxentius near Rome; the surface of the walls formed with alternate courses of triangular and squared blocks of tufo, or peperino; the center of the wall was filled in with rubble.
Seroux
Vault under the steps of the Circus of Caracalla Maxentius near Rome, showing a similar construction.
Seroux
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It's along the Appian Way, southeast of Rome. Note the remains of the Tomb of Romulus, the son of Maxentius who died a boy, immediately adjacent the circus.
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Circus of Maxentius (Rome: Via Appia, c. 309).
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