Palace spiral (Polygon mesh 3D model) is available on CGTrader for $150. Original author: theovazinin.
STL (Stereolithography, filesize: 159 KB), OBJ (OBJ, filesize: 139 KB), 3DS (3D Studio, filesize: 168 KB), DAE (Collada, filesize: 393 KB), FBX (Autodesk FBX, filesize: 317 KB), IGE (IGES, filesize: 299 Bytes), MAX (Autodesk 3ds Max, filesize: 319 KB), SKP (Sketchup, filesize: 1.49 MB), OTHER (Other, filesize: 164 KB)