 Popular tourist attractions include the archaeological sites of the Minoan civilisation, the Venetian old city and port of Chania, the Venetian castle at Rethymno, the gorge of Samaria, the islands of Chrysi, Elafonisi, Gramvousa, Spinalonga and the Palm Beach of Vai, which is the largest natural palm forest in Europe.Crete has an extensive bus system with regular services across the north of the island and from north to south.There are two regional bus stations in Heraklion.