acropolis ancient architecture Athens classical elements Greece Greek historical landmark old parthenon pediment pillars Remains ruins stones barrier carved doors double madrid secure security shut Spain spanish stone threshold wooden 18th century arch bridge Buckinghamshire covered England english Great Britain Palladian Stowe Landscape Garden water art blue building classic design frame gable glass grid house order palace roof sky window yellow apartments black elegant homes houses iron London pediments railing style stylish windows wrought grand home mansion ornamental ornate pink portico railings residence lamp reconstruction renovation repairs restore columns road street door entrance pillar porch slope sloping steps wiltshire