Galápagos Islands, Ecuador

Do we really have to explain the allure of the Galápagos? If you can, make it a priority to visit this of-another-time stretch of Ecuador, with dinosaur-like giant tortoises lumbering through the tall grass and real-life blue-footed boobies. (Pro tip: A cruise is definitely the preferred way to explore the islands; Celebrity Cruise’s Xpedition ferries just 100 passengers and holds nightly lectures by naturalists from Galápagos National Park.)