Italy
This bay in eastern Sardinia has water that has to be seen to be believed. Bright blue, green, turquoise and even purple. Hidden coves are backed by a mountainous, rocky and remote national park, which means the beaches can only be reached by boat. Out of season you can rent a dinghy for a reasonable price and have the place (almost) to yourself. Absolutely stunning.
Boats can be rented from Cala Gonone, which is 120kms south of Olbia. Catch a bus from Olbia to Dorgali and then a bus to Cala Gonone.
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