were underground (aquæductus subterranei) under the Cælian hill. The aqueduct Marcia disappears behind the temple of Honour and Virtue.
A bird’s eye view of the entrance to the underground part of aqueducts
under the Cælian hill. The gate that can be seen at the top of the
picture in the foreground is the Porta Capena (see “gates”).
The double aqueduct in a closer sight.
Top right, the crossing of the Via Nova.
This picture shows us that both aqueducts disappear and become underground
again a little further to supply water to the Baths of Decius and Sura on the Aventine.
Both aqueducts as they are elevated. In the background the great Aqueduct Claudia.