The Eiffel Tower grows up to 15 cm taller during summer heat.

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The Eiffel Tower in Paris is constructed from 7,300 tonnes of puddle iron (a refined form of wrought iron). Under the principle of thermal expansion, iron expands when exposed to heat and contracts when chilled. During midsummer heatwaves exceeding 35°C (95°F), the metallic lattice expands along its 330-meter frame, causing the summit to elevate by up to 15 centimeters (6 inches). Uneven solar heating on one side also causes the tower tip to lean away from the Sun by up to 9 cm.

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