Iron was also used in [[construction]]. The [[Eiffel Tower]] and [[Golden Gate Bridge]] are both made of iron. The strength of iron meant that [[engineers]] could build much bigger structures with it than with stone. | Iron was also used in [[construction]]. The [[Eiffel Tower]] and [[Golden Gate Bridge]] are both made of iron. The strength of iron meant that [[engineers]] could build much bigger structures with it than with stone. |