The Louvre in Paris is the world's largest art museum and a historic monument housed in the Louvre Palace. While the palace dates back to the 12th century, its most recognizable modern feature is the Louvre Pyramid, designed by architect I.M. Pei and completed in 1989. The pyramid serves as the museum's main entrance and was initially met with fierce controversy for its stark contrast to the classical French Renaissance architecture. It is constructed entirely of glass segments and metal poles, reaching a height of 21.6 meters. Pei insisted on a special type of 'extra-clear' glass to ensure the color of the palace behind it was not distorted. The museum houses over 38,000 objects, including the 'Mona Lisa' and the 'Venus de Milo.' It is so vast that it is estimated to take 100 days to see every piece of art for just 30 seconds each.