There’s a chance the party was held on the occasion of the 20th anniversary of the pyramid’s inauguration.

The Great Pyramid of the Musée du Louvre, lit up in red and green for a party, Tuesday April 28th, 2009.

See the photographs I have taken on trips to Italy

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 Go to the index page of pictures of the musée du Louvre.
There’s a chance the party was held on the occasion of the 20th anniversary of the pyramid’s inauguration.