After more than two centuries as a royal palace, the Louvre is opened as a public museum in Paris by the French revolutionary government. Today, the Louvre's collection is one of the richest in the world, with artwork and artifacts representative of 11,000 years of human civilization and culture. The Sheikh Zayed Grand Mosque is one the world's largest mosques and a massive architectural work of art that intentionally blends different Islamic architectural schools. It features 82 domes, more than 1,000 columns, 24-carat-gold gilded chandeliers and the world's largest hand-knotted carpet.