The Eiffel Tower has never been mentioned in dialogue, but it has appeared numerous times in establishing shots of Paris. In fact, the script of "Homefront" is the only Star Trek script to mention the Eiffel Tower in its stage directions. The structure was also, however, referenced in an early story outline for TNG: "The Best of Both Worlds, Part II", in which the Eiffel Tower was originally to have appeared, with a Borg cube looming over it; this would have established that the Eiffel Tower remained as a dominant sight in Paris at least until 2367.  Built in 1889, the Eiffel Tower was designed by the Human Gustav Eiffel, who also designed the structural framework for the Statue of Liberty in New York City; coincidentally, a scene in ENT: "Storm Front, Part II", in which Hitler views the statue from a boat in New York Harbor, was created by digitally altering footage taken at the Eiffel Tower when he visited conquered Paris in 1940.
The novelTrapped in Time mentions that the Eiffel Tower was destroyed during the Third World War and later rebuilt. The front cover of the novel depicts the Eiffel Tower during the Nazi occupation, in spite of the fact that all of its 1944 scenes take place in Normandy.