This mosaic at a building in Vienna reminds pedestrians of an ancient gate (porta principalis dextra) that stood here in the 1st century. It was part of the Roman fort Vindobona, the nucleus of modern Vienna.
Porta principalis dextra in Vienna
The porta principalis dextra was the main gate of the so-called right side of the military fort Vindobona. You will find the painting on a building at the corner of Rotenturmstraße / Lichtensteg in Vienna’s 1st district.