This is a section of an aqueduct known as the Aqua Claudia, part of which survives in a park in Rome, 8km from the city centre. Construction began under Emperor Caligula and was completed by his successor Emperor Claudius.
Click here for a map charting the course of the aqueduct from its sources in Anio Valley, to the east of the city: en.wikipedia.org/wiki/Aqua_Claudia#/media/File:Aqua_claudia_planlatium_2.png
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