The Eiffel Tower...of course!
The Eiffel Tower, Notre Dame, The Champs-Elysées, and more...the classic Paris sites are classic for many reasons. They are gorgeous, timeless, and elegant, and everyone should see them at least once.
But don't miss the other classic Paris experiences. A walk along the Seine, a warm croissant, your portrait sketched while you wait, so much is classic about Paris, and to me, it never, ever gets old.
Oh, and a drive across the river at night to see the lights...sublime.
Montmartre, Lamarck-Caulaincourt metro
Sacré Coeur Basilica