The Louvre Museum: The Louvre is an absolute must if you are in Paris. It is not only a historic monument, but it is the worlds largest art museum. Yes, I said art museum, but if you you are not a fan of art, no worries, there are several things to appreciate within this massive underground paradise. It is family friendly and full of interesting things to see. World famous paintings and sculptures lie within. However, the architecture is also captivating! Its size has significantly increased since its original opening in August of 1793 when it only held 537 paintings. You could easily spend an entire day inside, but if your time is limited I suggest looking ahead at what you want to see most. They have a wonderful app called "Audioguide Louvre" that is fairly detailed about where things are, as well as a full audio tour option if you are planning on doing the entire museum. Fun Fact: The Louvre was originally a fortress built in 1190 before the royal family decided to move into Versailles and it was turned into a museum.