Fast-growing Viking has one of the most diverse arrays of itineraries of any cruise line.
Not only does the California-based company offer ocean cruises in almost every corner of the world, it also offers river cruises on many of the world's major rivers. That's notably different from most cruise lines; typically, cruise lines operate either ocean or river cruises, but not both.
Viking has a particularly large footprint when it comes to European river itineraries, with a wide range of sailings on nearly every European river of note, from the Danube and Rhine in Central Europe to the Douro in Portugal.
A great solo travel tip spotted this week on The Points Guy Articles.
