premise: Upriver , east of Blois , in a huge densely wooded park surrounded by 31 km ( 20 miles ) of high walls , the brilliant white Ceteau de Cham ? ­ ? ­bord is the most extravagant of all the royal residences in the Loire Valley .
hypothesis: The Ceteau de Chambord is an ugly , unremarkanle hut in an open field .