Travel requirements for Europe continue to evolve. Depending on your itinerary, you may need an Electronic Travel Authorization (ETA), a European Travel Information and Authorization System (ETIAS) approval, or other entry requirements before your cruise. The easiest way to know what's required is to verify your itinerary using official government websites before you travel.

The Smart Traveler Enrollment Program (STEP) is a free service offered by the U.S. Department of State that allows U.S. citizens to register their international travel. While enrollment isn't required, many experienced travelers choose to use it because it helps the U.S. Embassy contact you in the event of an emergency or major disruption.

Maybe, but don't assume you'll be able to board your ship. Whether you can continue with your cruise depends on your itinerary, the countries you'll visit, your citizenship, and the type of replacement travel documents you receive. If your passport is lost or stolen before embarkation, act quickly and contact the appropriate officials immediately.

For most international cruises, yes. While some cruises allow U.S. citizens to travel with other forms of identification, a valid U.S. Passport Book is the simplest and most widely accepted travel document. Even when a passport isn't required, many experienced travelers choose to carry one for added flexibility and peace of mind.