Oslo's prices may be staggeringly high, but at least they're consistent. Norway's capital has held on to the No. 1 spot on the UBS Prices and Earnings report's most expensive list since 2006. And it's not just hotels that will gouge travelers' pockets: In 2009, the New York Times noted that a bottle of water costs roughly $6 USD. Money-saving tactics -- like visiting in July or August when most residents are on vacation -- do little to curb the expense of an Oslo trip.