In our travel roundup this week: the European capital with an underwater labyrinth beneath its streets, why an Abu Dhabi surf company believes it’s found “the perfect wave,” plus the rise and rise of XXL cruise ships.

You’re going to need a bigger boat

The world’s largest cruise ship, Icon of the Seas, has been the biggest hit Royal Caribbean has ever introduced, the CEO told Terry Ward, reporting for CNN earlier this year. Now the Icon Class family is expanding, with three equally hefty sister ships.

Star of the Seas entered service in August with Eastern and Western Caribbean itineraries, which call at Royal Caribbean’s private island, Perfect Day at CocoCay.

Legend of the Seas, which will be home to Category 6, the largest waterpark at sea, was floated out for the first time at the

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