The Barracks Arch is located on the corner of Malcolm and Elder Streets, at the western end of St Georges Terrace in Perth, Western Australia.
Wikipedia https://en.wikipedia.org/wiki/Barracks_Arch
Official website http://heritageperth.com.au/barracks-arch-article/#_=_
Address 870 Elder St, Perth WA 6000, Australia
Coordinates -31°57'8.02" N 115°50'55.952" E