World's Best 2018 Awards Rank: #6 River Cruise Line
Best for: Luxury lovers searching for memorably fabulous Continental cuisine and top-notch service.
Sails: Rhine River, Moselle River
At a Glance: This was the first of Crystal River Cruises’ new builds, and it was a game changer. Every single cabin has a balcony and a butler, features that are common on luxury ocean ships but rarities in the rivers.