O'rrh Sim Castle Ruins is a Scenic Viewpoint in Xenoblade Chronicles X. It is located in central Cauldros, around the southern and western perimeter of the Ganglion Weapons Hangar. It is reachable from FN Site 506 and Ruined City of O'rrh Sim. A teleporter to the Forgotten Mining Frigate above FN Site 506 is located within the castle. As with all Scenic Viewpoints, its discovery yields an achievement ("Upon the O'rrh Sim Castle Ruins").