Crete is the most popular Greek island and one of the most visited destinations in the Mediterranean Sea. It is the world’s 88th and the Mediterranean's 5th largest island. Heraklion is the capital and the largest city on the island. The cities of Chania, Rethymnon, Heraklion, and Agios Nikolaos are the most popular destinations on the island. Annually, thousands of tourists visit the island for its beaches. Popular sites of the island are; Agios Nikolaos city, Unesco Biosphere Reserve Samaria National Park, Rethymnon, Diktaion (Psychro) Cave, and Preveli Monastery.