ancient architecture battlements castle defend defensive dordogne France french historical old power protect roof secure stone strong tower turret windows art brick build building canvas construction drawing elevation front home house illustration pastel rendering rough sketch texture trees Alley alleyway Catalan catalonia Catalunya elements lamp light passageway Spain spanish steps village wall business business center city Gherkin glass mary axe Norman Foster office round shape skyscraper Swiss Re Building defence defense England english fort Great Britain kent security stronghold Walmer doors pavement restored road shutters street vine aperture architectural blue bricks cloud pillar pillars relic ruined sky stones visit visiting whole window yellow broken decay decayed disrepair glasses glasshouse hothouse of pane pipe pipes plants rust rusty green greenhouse greenhouses houses