The best cruise itineraries offer history, culture, or natural beauty, as well as interesting embarkation ports and convenient (and affordable!) connections. Pick one of these routes — which we consider the best choices in the cruise world — and you can explore an amazing destination by ship. Just be sure to pick the right month to travel, when the weather is just right and the crowding is at a minimum. Read on for our favorite itineraries and when you should sail there. Bon voyage!