Editor’s note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter . Get news about destinations, plus the latest in aviation, food and drink, and where to stay. CNN  —  In travel news this week, the most elite penthouse stays in London’s legendary Mayfair, phenomenal natural landscapes from Turkey to Utah, plus the brothers who want to help find you a one-euro home in Sicily. The Penthouse at Mandarin Oriental Mayfair Struggling to find a four-bed suite in London’s most upscale and