The exterior of the classical-styled building is buff Indiana limestone. More than 700 train carloads of limestone and 4,640 tons of steel were used in its construction. The magnificent 293- foot gold dome which tops the structure is five feet higher than the dome of the U.S. Capitol. The entire dome is gilded in 23 ½ karat gold leaf applied to the copper and lead roof in tiny 3 3/8 inch squares...
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