architecture barrier defence defensive engineering England english flood gray Great Britain grey hood landmark London protection river steel thames tidal tide water abstract backdrop background backlit black circles grid light metal metallic plate regular round shape shapes solid structure structures texture textures yellow arch blue border canvas construction decoration detail detailed eiffel Eiffel tower frame light blue limit ornament silhouette sky tour decay design desktop graffity grafitty graphic graphic design grunge grungy old paint paint pattern patterns rust rusty urban urban decay colored colors dark jazza oxide plates rough sheet speckled textural textured weathered bunker cold war concrete door door handle Hardware accessory latch lock paint peeled wall war wood beggar bridge cables central city clyde cross glasgow homeless passenger pedestrian people span steel.old suspend suspension Victorian walk walkway Arteixo building clouds coruna electricity energy eu framework galicia iron line lines power pylon pylons Spain tower transformer