The Louvre is the world's largest museum. It was originally a fortress built by Philippe-Auguste in the 13th century. 300 years later Francois I 1 it with a Renaissance style building. It was first opened to the public in 1793 and 2 as a museum ever since. The latest addition to the building is the glass pyramid which was designed by I. M. Pei. The pyramid 3 in 1989. The Louvre's collection is overwhelming in size and it 4 paintings, sculptures, antiquities, furniture, coins, etc. So, it is impossible to see everything in one day.