If you need two good reasons to see the Louvre here they are; Mona Lisa and the Winged Victory of Samothrace (Nike of Samothrace). The first one is way smaller than you think and the second one way bigger.
The Louvre is the most famous museum in the world. It is the place that houses world treasures in a spectacular surrounding environment. The scale of the Louvre collection is so big that it is very difficult to see everything. At least see the “stars” of the museum or allow a full day and knock yourself out trying.
Do expect heavy crowds and watch out for your personal belongings.
You can buy tickets for the Louvre from the Paris Pass website.