The Arch of Augustus was the triumphal arch of Augustus, located in the Roman Forum. It spanned the Via Sacra, between the Temple of Castor and Pollux and the Temple of Caesar, near the Temple of Vesta, closing off the eastern end of the Forum. It can be regarded as the first permanent three-bayed arch ever built in Rome.
The archaeological evidence shows the existence of a three-bayed arch measuring 17,75 x 5.25 meters between the Temple of Caesar and the Temple of Castor and Pollux, although only the travertine foundations of the structure remain.
Wikipedia https://en.wikipedia.org/wiki/Arch_of_Augustus,_Rome
Address 15 Via in Miranda, Roma 00186, Italy
Coordinates 41°53'31.087" N 12°29'10.653" E