<p>One of the newest ships on this list, <em>Crescent</em> was built by Lurssen in 2018 and is just less than 445 feet long. This sleek ship's exteriors were designed by French yacht design firm Zuretti and its interiors by Monaco's Espen Oenio. It can house up to 18 guests and 24 crew and features a two-level glass atrium, a helicopter hangar, and a glass-bottomed pool. </p>