You already know what to expect from the Louvre -a massive, world-famous museum with an impressive collection of art. Huge crowds. Could spend days wandering the interior -and hours in line! To avoid some of that unpleasantness, I strongly advise you to order your tickets ahead online -while you can't print them at home (for some reason), you can have them mailed to you if you have enough advance planning, or else pick them up at one of several ticket locations. Then you can skip the hours-long line for tickets, and go into the much, much shorter line for people who already have tickets. (http://www.louvre.fr/en/advance-tickets) We spent only a few minutes in this queue, while the ticket queue was incredibly long.
I'd also advise skipping the Mona Lisa -it has an additional line, and is just not worth it. Depending on how much planning you like to do, and how much wandering you feel up for (again -it's a MASSIVE museum, you couldn't possibly see everything) you might want to look through the website and pick which exhibitions you are most interested in; they also have what they call 'visitor trails', which can be quite helpful -print it out at home since you most likely won't be able to access the web inside the museum (thick stone walls mean little to no reception on your smartphone).
Bottom line: worth a visit, requires a lot of time to see properly, and do everything you can to avoid those lines!
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