Answer about the Eiffel Tower and the Sydney Harbour Bridge

The Eiffel Tower is an iron tower .It's named after its designer,engineer Gustave Eiffel.The tower was built in 1887, was inaugurated on 31 March 1889.
John Bradfield designed the Sydney Harbour Bridge in 1912. But plans to implement the design were postponed until 1922, primarily because of World War I.It was finalised on 19 August 1930.On 19 January 1932 the first test train, a steam locomotive, safely crossed the bridge.It's a steel bridge, the steel used for the bridge was largely imported but the rest was Australian-made.