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Tokyo Tower from yumiko_sato on Flickr
"There's still life there..." from LeiraEnkai on deviantART
Wrigley Building from Tribune Tower from kmcmahon on Flickr
Jinmao Tower, Shanghai from liz on Flickr
Bodiam Castle from chuck624 on Flickr
Tower Bridge and the Memory of a Working River from jza_photography on Flickr
Lisbonne - Tour de Belem from baptiste on Flickr