Castle Koskina (or Castle of  Nikaria or Castle of Messaria) is located in the village Kosoikia, in the middle of the island. It used to be the strongest fortification of the Byzantine city Dolichi. It was built by the Byzantines on the top of a hill in the 10th century in order to host a small military unit that could oversee the surrounding area and the sea routes. Parts of the wall surrounding the top of the hill can still be seen nowadays. There is also the church of St. George Dorgana, a vaulted basilica, within which you can see columns of ancient buildings.

This is the largest village on the north side of the island. It is rather sparsely populated with traditional houses spread out in a dense forest. The village is known for the particular habits of the residents. For example the shops open late at night or stay open without a shopkeeper! In the summer, the island's visitors enjoy drinks and snacks in the local cafes. On August 6th there is a huge festival on the island, attended by hundreds of people.

This is the largest beach on the southern part of Ikaria. Here you will find sand and small pebbles combined with crystal clear waters and the natural shade from trees. It is ideal for families, couples and elderly.