what is the eiffel tower made of?
<answer> Riveted wrought iron, a material that will last virtually forever if it is painted regularly. <context> Eiffel Tower Maintenance. The Eiffel Tower is built of riveted (2.5 million rivets!) wrought iron, a material that will last virtually forever if it is painted regularly. Since it was built (for the International Exhibition of Paris in 1889), the tower has been painted once every seven years. Maintenance on the tower includes applying 50 metric tons of three graded tones of paint every 7 years to protect the 200,000 square meters of iron lattice work from rust.