For more than a century, the existence of a private apartment at the top of the Eiffel Tower has been kept a mystery, defying the logic of a city where square footage is scarce and highly valued. Located over 300 meters above the streets of Paris, the space offers a unique panoramic view of the French capital and reveals a lesser-known aspect of the engineer who designed the monument. Gustave Eiffel created the top floor of the tower, which was inaugurated as the centerpiece of the 1889 World's Fair, to house a private office of approximately 100 square meters. This space included a bathroom, kitchen, and custom-made furniture by sculptor and cabinetmaker Jean Lachaise but lacked a bedroom, indicating that the engineer did not spend the night there. The apartment symbolizes the innovative spirit of Eiffel and serves as a curious anecdote about one of the most visited monuments in the world. Its ongoing closure to the public adds to the intrigue surrounding the landmark and reflects the historical narrative of the Eiffel Tower, which continues to captivate visitors from around the globe.