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 — Amazing adventures, extraordinary landscapes and fabulous cuisine — the world’s greatest railway journeys are an unforgettable experience that can immerse you in the culture of a new country. Demand for luxury “land cruise” trains with five-star hotel-style accommodation is booming.