Subscribe | UPI Odd Newsletter Subscribe OLAFSFJOROUR, Iceland, May 31 (UPI) -- An Icelandic town celebrated the country's national holiday by taking turns speeding down a giant slippery water slide set up in a field. The Slip'N Slide-style water slide was set up in the city of Olafsfjorour for a celebration in advance of the upcoming Icelandic National Day. Advertisement