crumbling stone walls of an old roofless fort in ruins

africa architecture background beauty breech bright broken brown built chamber colour coloured complex concrete crumbling damage daytime decay dilapidated doorway environment flaking fort glow graffiti grunge historic inner inside light morning mortar old opening plaster pretoria red refraction remnant roofless room rough ruins rust sky south stained stains stone strong structures sunlight surface texture view vintage visible wall walls weathered window wonderboom