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Tucked beneath the famous highway that skirts Italy's Amalfi Coast, the Emerald Grotto (Grotta dello Smeraldo) is one of the most popular attractions on this iconic stretch of coastline. Discovered in 1932 by a local fisherman, this marine cave is known for the turquoise water that fills the cavern with an emerald-green light when the sun’s rays filter up through a fissure beneath its surface. It’s covered with limestone stalagmites and stalactites more commonly associated with inland caves, and attracts travelers to Sorrento and the Amalfi Coast.