The Great Barrier Reef, Machu Picchu, the Acropolis ... Wikipedia? Online encyclopedia Wikipedia has launched a global petition to make it onto the UNESCO World Heritage list. If successful, it would be the first ever digital entity in the prestigious directory. Wikipedia said it knows it's pushing UNESCO's boundaries Wikipedia is one of the top 10 most popular websites on the Internet, with 400 million visitors each month and a presence in over 270 languages. But does that make it a World Heritage site? The online giant certainly thinks so. "It is a global challenge to recognize, support and...