Two of Royal Caribbean's newest ships both promise big thrills and nonstop memory-making. But from vibe to voyage length, Utopia of the Seas and Icon of the Seas offer different vacation experiences.

A photo taken on May 15, 2016, shows the Harmony of the Seas cruise ship as it sails from the STX Saint-Nazaire shipyard, western France out to sea. The ship took emergency action to avoid ...

There's still two months to go before the first paying customers climb on board, but Royal Caribbean officially took possession of the world's largest cruise ship Icon of the Seas.