Also known as Bioluminescent Bay, Bahia Mosquito is filled with a species of phosphorescent dynoflagellate, making the waters glow — it’s a magnificent sight, particularly in the dark. The microorganisms are harmless. Avoid any cruise offers that use motor boats, though, as the pollution significantly kills off the phosphorescent organisms, minimizing the unusual effect. Instead, opt for one of the many eco-friendly kayak tours available. (USA Today)