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A picturesque view of the Eiffel Tower lined by trees and classic Parisian architecture.

The Eiffel Tower can grow up to around 15 centimetres taller during a Paris summer because its 7,300 tonnes of iron expand in the heat, and the structure also leans slightly away from the sun as the heated side stretches faster than the shaded side

On a hot Paris afternoon, the Eiffel Tower’s 7,300 tonnes of wrought iron can stretch more than 15 centimetres taller and lean several centimetres away from the sun — a 135-year-old demonstration of thermal expansion playing out above the Champ de Mars.

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