Editor’s Note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get news about destinations opening, inspiration for future adventures, plus the latest in aviation, food and drink, where to stay and other travel developments. CNN  —  “You are in room nine, it’s one of our binational rooms,” the hotel manager confirmed with a smile, handing over an old-school metal key. I could hardly contain my delight. If the prospect of showing up at a hotel not knowing which country I would be sleeping in that night was already thrilling, what about sleeping in two countries at the same time? It had been a long drive through winding roads…