metal metalwork monotone old past rusty spiral spriral staircase staircase stairs arch bridge buildings gallery historic old town square town tree windows brittle edge grunge paper paste paper scrap scrapbook torn vintage background book border color dirty texture Altstadt cathedral cologne dom germany Köln Rhein rhine skyline beige brown dappled light pale plaster speckled wall amber ochre yellow barbed pattern Prickly rust spiked spiky spiny thorny wire bars bosnia herzegovina mostar old house prison sky stone house window ancient close door entrance gree key open rural wood