National Geographic
Spending over 100 nights on a cruise ship might not be for everyone. But for those who long to see the world from pole to pole or sea to sea, these once-in-a-lifetime journeys may be just the thing.
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How to take a trip around the world
Megan duBois
12:20
Spending over 100 nights on a cruise ship might not be for everyone. But for those who long to see the world from pole to pole or sea to sea, these once-in-a-lifetime journeys may be just the thing.
