Epic hyperrealistic ruined castle tower, cylindrical medieval stone structure with battered battlements and partial wall collapses draped in creeping ivy, featuring a fully navigable spiral staircase linking a ground-level entrance to a rooftop exit, clean mid-poly topology capturing individual stone blocks, crack patterns and erosion crevices, optimized UVs, 8K PBR textures of weathered gray sandstone, dark red brick, damp moss and aged oak wood, detailed normal and displacement maps for chiseled edges and collapsed sections, varied roughness for stone, brick and wood, zero metallic, real-time engine and cinematic close-up ready.