<p>Mix&nbsp;together&nbsp;mortar&nbsp;and&nbsp;lime&nbsp;with&nbsp;pressed hay and you too can construct a Tower of Gold, or at least the illusion of one. If you have any doubts, pop on over to Seville, yes, the one in Spain, and have a look at the original Torre de Oro.&nbsp;Particularly entrancing is&nbsp;the&nbsp;vision of&nbsp;this&nbsp;13th&nbsp;century dodecagonal watchtower at night.&nbsp;The gilded color reflected on the waters of the Guadalquivir River is as rich as you&rsquo;ll ever be fortunate enough to behold.</p>