Today’s cruise ships are sophisticated feats of engineering, but navigating a winding European river is very different from crossing the open ocean. In this episode of The Don Sullivan Show, Don cruises along Germany’s scenic Moselle River and explores the differences between river and ocean cruise ships, from their size and design to navigation and technology. He also looks back at the remarkably versatile Viking ships of centuries past, which were built to navigate both rivers and open seas. Come aboard as Don explores the history, technology, and engineering behind these two very different approaches to cruising.