It’s one of the most impressive and among the most important castles that can be found in Hellenic areas.

Built to the south-east of Mount Olympus, it dominates the street that links Macedonia with Thessaly. From its eastern side it rules over the entire marine region. Its location right in the passage of Macedonia and Thessaly made this castle the key of control for Macedonia. Along with the castle of Kassandra, they were the guardians and prisons of gulf Thermaikos. Before its conversion into a Byzantine fort, it was the centre of ancient Herakleias which was likely built in the 5th century.