Vaulting 1-1 Romanic 500m spaced simple Low-poly (Polygon mesh 3D model) is available on CGTrader for $14. Original author: ar3ding. Specs: 747 polys, 786 verts.
OBJ (OBJ, filesize: 10.7 MB), MAX (Autodesk 3ds Max, filesize: 5.32 MB), OTHER (Other, filesize: 5.78 MB), BLEND (Blender, filesize: 5.84 MB)