Eiffel Tower

1. What is the Eiffel Tower, and why does it matter?

The Eiffel Tower is a wrought-iron lattice tower standing on the Champ de Mars in Paris, built between 1887 and 1889 as the centrepiece of the Exposition Universelle, the World's Fair organised to mark the centenary of the French Revolution. At the moment of its completion it was the tallest structure ever built by human hands, standing 300 metres high and surpassing by twice the height of the dome of Saint Peter's Basilica in Rome and the Great Pyramid of Giza. It matters because it was unlike anything that had come before it: a structure that demonstrated what industrial-age engineering could achieve, and that permanently altered the relationship between architecture and engineering. What had been designed purely as a temporary exhibition gateway became, over time, the most visited paid monument in the world, the global symbol of Paris, and one of the most recognised images in human history.

2. Who designed the Eiffel Tower, and how did the idea originate?

The tower is named after Gustave Eiffel, the French engineer and entrepreneur who owned the company that built it and whose personal vision and energy drove the project to completion. But the original design concept came from two senior engineers in his firm: Maurice Koechlin and Émile Nouguier, who in June 1884 sketched out a proposal for a very tall tower built on the principle of a large pylon, four columns of lattice girders spreading wide at the base and converging toward a single point at the top. Eiffel initially showed limited enthusiasm for the idea, but commissioned the architect Stephen Sauvestre to develop its appearance, adding ornamental features including the distinctive arched bases at ground level that give the tower its recognisable silhouette. Eiffel then championed the project aggressively, registered a patent for it in September 1884, and successfully submitted it to the competition for the 1889 World's Fair, where it was chosen from over 107 competing proposals.

3. What were the structural and engineering principles behind the design?

The tower's form was not primarily an aesthetic choice but an engineering solution to a specific and unprecedented problem: how to build a structure 300 metres tall in a city famous for its winds. The curvature of the four outer legs was calculated mathematically to offer the optimal resistance to wind pressure, distributing the lateral forces smoothly down through the structure into the foundations. Eiffel made this explicit in his famous public defence of the tower: he argued that the primary condition governing the design was wind resistance, and that the curves resulting from this calculation would also produce a powerful impression of beauty, since strength and elegance obeyed the same underlying rules. The structure is built from puddle iron, a refined form of wrought iron that Eiffel considered the most robust material available. It contains 18,038 individual metal pieces joined by 2.5 million rivets, all prefabricated to tolerances of one millimetre at a factory in Levallois-Perret on the outskirts of Paris and assembled on site without any drilling or shaping.

4. How was the tower actually built, and how long did it take?

Construction began on 26 January 1887 and was completed on 31 March 1889, a total of two years, two months and five days — an extraordinary pace for a structure of such unprecedented scale and complexity. The foundation work was carried out first, with hydraulic jacks fitted to the base of each leg so that the angle of each could be adjusted with precision as construction rose. The four legs were initially built as separate cantilevers, leaning outward and unsupported at their upper ends, a sight alarming enough to generate sensational newspaper headlines during construction. About halfway to the first level they were brought together with the aid of timber scaffolding and connected by horizontal girders. From that point the tower rose as a single unified structure. The work employed a maximum of around 300 workers on site at any one time, a remarkably small number for a project of this scale. Despite the danger inherent in working at great heights with heavy metal, only one worker died during the entire construction, an exceptional safety record for the era.

5. What protests and controversies surrounded the tower before and during its construction?

The announcement of the tower’s construction provoked one of the most celebrated cultural controversies in French history. On 14 February 1887, the newspaper Le Temps published on its front page a formal protest signed by around forty-seven of France’s most prominent artists and intellectuals, including the composer Charles Gounod, the novelist Guy de Maupassant, the novelist Alexandre Dumas fils, the architect Charles Garnier, the painter William-Adolphe Bouguereau, and a number of leading poets. They described the project as a useless and monstrous structure, a colossal black factory chimney that would crush and humiliate the noble monuments of Paris, and a dishonour to French civilisation. Maupassant, who detested the tower so thoroughly, allegedly took to dining at its restaurant specifically because it was the only spot in Paris from which the tower itself could not be seen. Garnier, the architect of the Paris Opéra, led what became known as the Committee of Three Hundred — one member for each metre of the tower’s height — in sustained opposition. Eiffel responded with characteristic directness, defending the intrinsic beauty of engineering and insisting that no one could fairly judge a building that had not yet been built.

6. How was the tower received when it opened?

The opening of the Exposition Universelle on 6 May 1889 resolved the controversy in the most decisive possible way: the public adored the tower. On the day of his dedication ceremony, 31 March 1889, Eiffel climbed the 1,710 steps to the summit and raised a large French tricolour flag. When the fair opened to the public, more than two million people paid to ascend the tower over the course of the five months it ran, making it an immediate and overwhelming popular success. Famous visitors included the Prince of Wales, the actress Sarah Bernhardt, and Thomas Edison, who visited Eiffel's private apartment at the very top and presented him with one of his phonographs, signing the visitors' book with an admiring inscription. The artists who had predicted humiliation and mockery from foreign visitors found themselves entirely wrong. The protests fell silent in the face of the evidence. Within a few years, writers and painters who had initially reviled the tower began to find it beautiful, and the Impressionists and Post-Impressionists incorporated it eagerly into their work.

7. Was the tower meant to be permanent, and how was it saved from demolition?

The original agreement under which Eiffel built the tower granted him a twenty-year licence to operate it commercially, after which it would pass to the city of Paris, which could choose to demolish it. Eiffel was well aware that his tower faced this threat and acted strategically to make itself indispensable. From the early 1890s he equipped the summit with scientific instruments: a meteorological station was installed in 1890, and in 1898 the French scientist Eugène Ducretet used the tower to make the first wireless radio transmission in France, establishing contact with the Panthéon across the city. In 1903 Eiffel funded military radio experiments from the tower, which could reach audiences more than four hundred kilometres away. By the time the twenty-year licence expired in 1909, the tower's value as a radio antenna was so self-evident that no serious case for demolition could be made. It was retained permanently. During the First World War its radiotelegraphic station jammed German communications, contributing to the Allied defence at the First Battle of the Marne, and the names of intercepted enemy agents, including the spy Mata Hari, were reportedly identified through signals intelligence gathered from the tower.

8. What happened to the tower during the German occupation in the Second World War?

When German forces occupied Paris in June 1940, French engineers cut the elevator cables so that the new occupiers would have to climb on foot to hoist their flag. The tower was restricted to German visitors throughout the occupation. A large German flag was raised at the summit but blew away within hours and was replaced by a smaller one. Adolf Hitler visited Paris only once, in June 1940 immediately after the fall of France, and chose to view the tower from a distance rather than ascend it. As the Allied armies approached Paris in August 1944, Hitler ordered the military governor of Paris, General Dietrich von Choltitz, to demolish the tower and the city along with it. Von Choltitz refused to carry out the order, and Paris and the Eiffel Tower survived intact. The lifts were repaired and the tower reopened to the public in 1946.

9. How did the tower's physical form evolve over time, and what does it look like in detail?

The tower stands on four masonry piers arranged at the corners of a square, each pier supporting one of the four arched iron legs that curve inward and upward to meet at a single vertical shaft. There are three platforms at different heights: the first at 57 metres, the second at 115 metres, and the third at 276 metres. The Otis Elevator Company of the United States designed the original glass-cage elevators, which ascend the curving legs on a diagonal track, an engineering challenge that became one of the tower's most celebrated features. The original height of 300 metres grew over time as broadcasting equipment was added to the summit. A television antenna added in 1957 increased the height to 320 metres, and the current height with all antennae stands at 330 metres. Eiffel had 72 names of French scientists and engineers engraved around the first-floor balustrade in recognition of their contributions to science, a deliberate and pointed response to the petition of artists who had accused him of caring nothing for culture. The tower is repainted every seven years, requiring some 60 tonnes of paint, a schedule Eiffel himself established and which has been maintained ever since.

10. What is the Eiffel Tower's legacy, and how did it change architecture and engineering?

The Eiffel Tower's most important legacy is the case it made — permanently and beyond any possibility of doubt — that engineering could produce structures of beauty without ornament or historical reference. Before its construction, the dominant assumption among architects and critics was that genuine beauty in building required the vocabulary of classical architecture: columns, arches, carved stone, historical allusion. Eiffel argued, and the tower proved, that a structure shaped by nothing but the mathematics of load and wind resistance could be more beautiful than any deliberate aesthetic gesture. This argument was taken up by the architects and theorists of the twentieth century and became the founding principle of modernism. The tower itself held the title of world's tallest structure until 1930, when the Chrysler Building in New York surpassed it. It was designated a historic monument in 1964 and became part of the UNESCO World Heritage Site of the Banks of the Seine in 1991. Today it receives around seven million visitors a year, making it the most visited paid monument on earth, and its silhouette, instantly recognisable on every continent, remains the defining image of France.