Capri's legendary sea cave glows with an otherworldly blue light, though it's best visited early morning or late afternoon to dodge tour groups crowding the small entrance.
“Capri’s most famous attraction is the Grotta Azzurra, an unusual sea cave illuminated by an otherworldly blue light.”
– Lonely Planet
Fodor's
"Only when the Grotta Azzurra was "discovered" in 1826 by the Polish poet August Kopisch and Swiss artist Ernest Fries, did Capri become a tourist destination." Full review
Independent
"Even the Blue Grotto is worth a peek at the right time, when the crowds have dispersed"
Experts' Choice Award 
Fodor's
Independent
