The North / East Aegean islands are spread across the northern and eastern Aegean. Lesvos, Chios and Samos lie close to the coast of Turkey. Samos has the ancient city of Pythagoreion and Chios has the Nea Moni monastery, both UNESCO World Heritage Sites. Ikaria has forests and thermal springs, and Samothraki and Thassos have mountains and waterfalls. Lemnos has a castle above its main town and sandy beaches.