The Louvre Museum is one of the most famous museums in the world and is a perfect place to spend a rainy afternoon in Paris. The museum is home to over 35,000 works of art, including the famous Mona Lisa painting. You can easily spend hours exploring the different galleries and admiring the art. The Louvre also has several cafes and restaurants where you can grab a bite to eat or a cup of coffee while you take a break from the rain.