3 facts
Due to thermal expansion, the iron structure of the tower expands when heated by the sun, causing it to grow in height. Conversely, it contracts in colder temperatures, returning to its original size, a testament to the properties of its material.
Due to thermal expansion, the iron structure of the Eiffel Tower expands in the heat, causing it to increase in height by up to 15 centimeters. Conversely, it shrinks back down in colder temperatures.
Despite popular myth, the Great Wall is too narrow and blends too well with its surroundings to be seen without aid from Earth's orbit. Astronauts confirm that while some human structures are visible, the Great Wall is not among them.