Aldous Huxley called it "the most beautiful lake in the world," and it's hard to argue. Atitlán fills the caldera of a megavolcano that blew its top 84,000 years ago: 340 meters deep — the deepest in Central America — ringed by three volcanoes and twelve Maya villages. You cross from one town to the next by boat, each with its own character. The water has no surface outlet: it drains underground. Hypnotic at any hour.