appearance arch arched architectural architecture barred bars building closed closed-doors colors colours construction dark distinctive doors doorstep doorway entrance exit exterior heritage historic historical lined lines locked metal metalwork old padlocked patterns perspectives secure secured security shut solid solid-walls steel steel-bars steel-gates stone stonework style textures walls wood wooden bar color decay grunge letters natural paint painted steel rust rusty tube tubes typo typography urban urban decay brown build concrete construction iron oxide rebar strength redbrown shadows closeup hard iron scaffold scaffolding stack stacked staging stuts texture grid matrix reinforce reinforcement reinforcements sharp squares steelwire tough