Palmyra Arch of Triumph Low-poly 3D model is available on CGTrader for $13. Original author: OttosLabs.
STL (Stereolithography, filesize: 17.7 MB), OBJ (OBJ, filesize: 28.3 MB), 3DS (3D Studio, filesize: 7.17 MB), BLEND (Blender, filesize: 28.2 MB), FBX (Autodesk FBX, filesize: 12.8 MB), DAE (Collada, filesize: 49 MB), OTHER (Other, filesize: 23.8 MB)