The Galapagos Islands, forged of black lava and named for the giant tortoises that are among their most noted inhabitants, are like no other place on Earth. Home to a profuse array of unique wildlife, the islands offer an immersion in nature that feels primeval. Iguanas and blue-footed boobies share the  beaches with us, unfazed by our presence. Friendly sea lions—and sometimes inquisitive porpoises—play with us in the clear turquoise water, as Galapagos penguins dart by and sea turtles glide past. Author Herman Melville, who visited the islands in 1841, shortly after Darwin's momentous visit, called them the "Enchanted Isles"—an apt moniker for a realm that remains otherworldly, even today.