Wikipedia can be incredibly helpful in cases like this. There was a thread recently where someone queried the use of "the" before proper names of places in London. Wikipedia clearly showed that "Crystal Palace" (as it is now known, usually connected with a football club) was originally officially called "The Crystal Palace".
If you Google "Eiffel Tower" you will find a Wikipedia link. Although the title of the entry is simply "Eiffel Tower", you will see that the first paragraph begins "The Eiffel Tower (La Tour Eiffel) ...".
La (French) = The (English).