The Eiffel Tower Myth Everyone Believes

You've probably seen the claim: the Eiffel Tower grows about 15 cm — half a foot — taller every summer. It's one of those "fun facts" everyone repeats. But it's not quite right. 🤯
Here's the truth. The tower is built from puddled iron, and iron does expand in the heat — so yes, it grows a little taller in summer and shrinks in winter. But the real vertical growth is small (the tower's own website says just a few millimetres), not 15 cm. So where does that famous 15-centimetre number come from? The lean. Because the sun only ever heats one side at a time, that side expands more than the others, tipping the top of the tower away from the sun. As the sun crosses the sky through a clear day, the very top traces a slow circular path roughly 15 cm wide — always leaning away from the light. In effect, the Eiffel Tower is a giant thermometer. The same physics moves bridges and railway tracks too.

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