A peculiar green light that casts an eerie emerald glow over impressive formations of stalagmites and stalactites, many of them underwater, inspired the name of the Grotta dello Smeraldo (Emerald Grotto). You can park at the signposts for the grotto along the coast road and take an elevator down, or you can drive on to Amalfi and return to the grotto by more-romantic means—via boat.
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