Metal is best used for structural purposes, mostly underneath walls and interiors and is usually hidden. Since metal is so strong it is a perfect material to hold up a large structure such as the expansion of the dome on the capitol building. Metal structures were also used when the white house went under renovation from the inside out. The most popular metals are iron and steel when using them for sturdiness. Applications have changed through time but not by much. Today, metals are still used for structural purporses but sometimes are exposed in designs rather than hidden to create a more rustic look.
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