The gate's single arch is built of irregular blocks of travertine, with a row of five windows above on the outside, and a sixth in brick, at the south end, surmounted by stone battlements. The arch is flanked by two semi-circular towers of brick-faced concrete (almost entirely rebuilt, probably in the 6th century), which do not rise above the top of the central section. The north tower rests on masonry foundations that may have belonged to a tomb.
See also
Porta Maggiore – Gate of the Aurelian walls, a landmark of Rome, Italy