1. London, U.K. Despite the cold, London is this winter’s top travel destination, according to TripAdvisor. (Sylvain Sonnet/Getty Images) At a Glance TripAdvisor’s Seasonal Travel Index Results listed the top travel destinations this winter.Planning a trip is the perfect way to break up the monotony of cold winter days. The top three destinations aren't in typically warm locations. Now that the busy holidays are behind us, many may be wondering what to do with the remaining two months of winter....