Crystal Cruises is offering a Kids Sail Free promotion for June and July voyages in Northern Europe and the Mediterranean.

Guests under 17 years old can travel for free when sharing a third berth stateroom with two adults on cruises booked now through Feb. 28. Crystal has three 10-day Serenity sailings in the Baltic and a 7-day trip in the Mediterranean.

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Fares start at $2,495 pp dbl cruise-only. For more information, call (800) 446-6620 or visit crystalcruises.com.