The fortress of Antimahia is situated on a hill at an altitude of 150 meters and dates from the fifteenth century. It has four sides, and 45,000 square meters in extent. It was built on huge volcanic rocks and its walls were completed in three stages. Inside you can admire the ruins of the barns, cisterns, two churches, one dedicated to St. Nicholas and the other to St. Paraskevi and those of some houses. Judging by the size of the fortress and the quantity of findings of numerous buildings, it is believed that the fort was intended to protect the population of the entire surrounding area.