Did they use any smart materials when they built the Eiffel tower?

Answer 1

The use of puddled iron (sort of wrought iron) was very daring and innovative at the time the Eiffel tower was designed. A building of the same high cannot be built with stone, as the bottom woud crush under the weight of the construction. The calculations Eiffel made about the material, as the movements of the tower because of the metal dilating due of the heat of the sun, are proved right and nearly perfectly accurate to this day.