Episode 4: In stunning Burgundy, Matthew and James visit the historic Chateau du Clos du Vougeot and the Confrerie du Chevaliers du Tastevin-the knights of the Order of Winetasters. But before they can choose a wine, they have to sit an exam. Joe competes in the Medoc Marathon, where every mile there is a chateau offering a sample of their latest vintage to all the competitors.