This specific 3D model, "Ruin gate Low-poly 3D model 24", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
This specific 3D model is provided under the "Unknown license" framework.
FBM (fbm, filesize: 35.8 MB), FBX (Autodesk FBX, filesize: 45.1 MB), MAX (Autodesk 3ds Max, filesize: 4.02 MB)