Oslo/Norway/Europe Extreme Sport Invasion in Norway/Market entrance of Red Bull The Venice surfer rides a sail boat wave Two international extreme sport stars paid a respectful visit to the Norwegian capital Olso this week: French trial biker Julien Dupont, who made a spectacular ride up and over the famous roof of La Defense in Paris, and Wakeboarder Duncan Zuur. The Dutchman surfed across the famous Piazza San Marco in Venice and onto the front pages and news broadcasts around the world. 15 Red Bull Minis rolled off the ferry into Oslo. Dupont first "danced" on the roof of Oslos new opera house with his motorcycle. It was quite slippery in certain spots, said the 29-year-old. Normally I stick to freestyle courses. Early morning eyewitnesses watched in awe at the sight never seen before: Someone riding on the outside of the Opera made out of sleek white Carrara marble with a trial bike does not happen every day. After that Dupont drove rode up onto the wooden steps to the Akerhus palace, the former royal residence. He balanced carefully on the old walls of the renaissance palace. Riding between the historic canons mounted on the walls Dupont demonstrated a few backwheel hops before he sped off to evade the oncharging security guards. Extravagant locations like this one here in Oslo have their own special allure. You get a real kick from it. Wakeboarder Duncan Zuur first flabbergasted pedestrians in the "Spikersuppa", the central square in Oslo -- strutting his stuff with <b>...</b>