Dubai's latest challenge: Zip-line across the iconic Dubai Fountains. The ‘X Line’ project, initiated by Dubai X, a company that runs action sport activities, was launched early this month with Shaikh Hamdan Bin Mohammad Bin Rashid Al Maktoum, Crown Prince of Dubai, being the first person to travel across the zip-line in front of Burj Khalifa. See more at: http://gulfnews.com/gntv