In particular:  Elafonissi Crete (No 6 in the rank), Saint Paul’s Bay in Rhodes (No 10), Paleokastritsa Corfu (No 15) Balos Crete (No 19) and Navagio Zante (No 24).

You can read more:

http://www.tripadvisor.com/TravelersChoice-Beaches-cDestinations-g4

And believe me Greece has plenty of beautiful and unique beaches like those!

Photo: from Elafonisos, which is located in the far south-west of Crete island!!