A castle under the museum
King Philip II built a fortress here around 1190 to guard Paris. You can still walk around the base of its walls and its moat, in the basement of the Sully wing.
The world's most visited museum started as a castle to defend Paris, became a palace the kings abandoned for Versailles, and opened to the public in 1793. Here's what you're looking at, and what to listen for when you get there.

King Philip II built a fortress here around 1190 to guard Paris. You can still walk around the base of its walls and its moat, in the basement of the Sully wing.
Kings rebuilt the Louvre as a palace from the 16th century, until Louis XIV left for Versailles in 1682. After the Revolution, the palace opened as a public museum in 1793.
In August 1911 a former worker, Vincenzo Peruggia, walked out with the Mona Lisa under his clothes. It was missing for two years and was found in Florence in 1913. The theft is a big part of why it became the world's most famous painting.
Its oldest part is a fortress from around 1190. It became a public museum in 1793.
The glass pyramid by I. M. Pei opened in 1989 as the museum's new entrance.
Yes, in 1911, by Vincenzo Peruggia, who had worked at the museum. It was recovered in Florence in 1913.