10. Kenya

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On an overland safari expedition from Nairobi into the Masai Mara and the Serengeti (without roads or power lines), you will see the world as it looked before human beings inhabited it. In Kenya, you are guaranteed to see tens of thousands of animals - wildebeest, giraffes, lions, elephants, rhinoceros and more) in a single day. It's an exceptional experience. Runners-up to the best 10: Copenhagen, St. Lucia in the Caribbean, Oxford University, Mexico's San Miguel de Allende, and Rio de Janeiro.