
The grotto was known to the locals under the name of Gradola, after the nearby landing place of Gradola, but it was avoided because it was said to be inhabited by witches and monsters.
The sunlight, passing through an underwater cavity and shining through the seawater, creates a blue reflection that illuminates the cavern.
There is a small hole in the cave wall and it is used as the entranceway. There is another larger hole lying directly below the entranceway, acting as the primary light source for the cave.
Tourists use rowboats to visit the Blue Grotto and they lie down while entering through the hole.
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