The fragmentary map of ancient Rome does show a portion of the Septizodium, an expensive facade designed to impress people arriving at the foot of the Palatine hill up the Appian Way. Here is the fragment.
The photo has East at the top. To the right is one end of the Circus Maximus. The Palatine hill is at the bottom. The Septizodium is the two semi-circles, with pillars in front of them, to the left of the Circus Maximus.
What I do not quite understand, tho, is why people say that this records the form of the name “Septizodium” rather than “Septizonium”. Surely the crucial letter is lost?