Metal expands when heated, and the Eiffel Tower is no exception. During hot summer days, the iron structure absorbs heat and can stretch upward by more than six inches. When temperatures drop, it gradually settles back to its normal height. Engineers designed it to flex and move with temperature changes, allowing it to remain stable year after year. #eiffeltowerfacts #engineeringinfo #wondersoftheworld #sciencefacts #amazingfacts