FILE - This is a Jan. 30, 2002 file photo of a visitor who walks through Housteads Roman Fort on Hadrian's Wall, near Hexham, Northumberland, England. A group of American artists is using 450 balloons and thousands of light emitting diodes to turn the 2,000-year-old Hadrian's Wall into the world's longest work of art. New York digital arts collective YesYesNo has been invited by organizers of Britain's Olympic-themed summer arts festival to transform the wall, built by Roman invaders to guard the northern frontier of their empire.(AP Photo/Dave Caulkin, File)
Read the article: Balloons to transform Hadrian's Wall into artwork
